Usually the kohlrabi bulb is woody because it was harvested too late or the weather is too hot. Do not allow the bulb to get too big. Bulb should be smaller than a tennis ball.
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Learn to Grow
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Planting Guide
- How do I plant mini tuber potatoes?
- What should I do when my bare roots arrive?
- How do I plant my garlic?
- What should I do when my potted annuals arrive?
- What should I do when my fruit tree arrives?
- How and when should I divide my herbaceous perennials?
- What should I do when my berry plants arrive?
- How deep should I plant my fall bulbs?
- Do you have any tips for planting fall bulbs?
- What should I do when my fall brassicas arrive?
- What should I do when my potted perennial arrives?
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Reference Charts
- Do you have a quick reference for blueberries?
- Do you have a fruit plant quick reference chart?
- Do you have a quick reference for peas?
- Do you have a quick reference for onions?
- Do you have a quick reference for cucumbers?
- Seed Counts
- Do you have a quick reference for sunflowers?
- Do you have a quick reference chart for herbs?
- Do you have a quick reference for fig trees?
- Do you have a scoville chart for hot peppers?
- Do you have a quick reference for squash?
- Do you have a quick reference for zinnias?
- Do you have a quick reference for pumpkins?
- Do you have a quick reference for marigolds?
- Do you have a quick reference for beans?
- Do you have a quick reference chart for spring garlic?
- Do you have a quick reference for corn?
- What seeds do you sell as seed tape?
- Do you have a quick reference for raspberries?
- Do you have a quick reference for strawberries?
- Do you have a quick reference for blackberries?
- Do you have a tomato resistance chart?
- Do you have a quick reference for roses?
- Do you have a quick reference for hydrangeas?
- Do you have a quick reference for fall garlic?
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Getting Started in Gardening
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Gardening 101
- How can I support my tomato plants as they grow?
- How much water do tomatoes need?
- How much sunlight do tomato plants need?
- Ho do I use the self-watering seed starting tray?
- How do you plant garlic?
- When does Days to Maturity (Days to Harvest) Start?
- Do you treat your seeds with Neonicotinoid pesticides?
- What are some tips for beginning my garden?
- How do I direct sow seeds?
- Can I use last years seeds?
- What are the types of Zinnia?
- How long does it take for marigolds to bloom from seed?
- Will my annuals come back next year?
- What are the types of strawberries?
- How do you tell if raspberries are ready to pick?
- What are the types of raspberries?
- What are the types of peppers?
- What are the classes of tomatoes?
- What are the types of cucumbers?
- What are the types of sweet corn?
- What are the kinds of beans?
- How do I plant asparagus?
- What are some quick tips about vegetable gardening?
- What are warm season vegetables?
- What is the meaning of workable soil?
- What are cool season vegetables?
- Can I use an overhead sprinkler to water my garden?
- What is seed tape?
- Which vegetables are perennial?
- What is a complete fertilizer mean?
- What does germination mean?
- What is a bedding plant?
- What is a cotyledon?
- What does Biennial Mean?
- What vegetables can you use Burpee Booster on?
- How do I use the Burpee Booster?
- What does Everbearing mean for strawberries?
- What does June bearing mean for strawberries?
- What is a Chill Hour in fruit plants?
- What kind of flowers only last one year?
- What kind of flowers come back every year?
- What does full sun, part sun and full shade mean?
- How do you plant Seed Tape?
- What are some easy Vegetables I can grow in my area?
- What are some easy flowers I can grow in my area?
- How should I store my seeds?
- How do I harden off my plants?
- Do you have any gardening videos?
- Do you have extra plant-o-gram sheets?
- What is the difference between Organic and Non-Organic seeds?
- What are some tips for kids to garden?
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Recommendations
- What are the best beets for juicing?
- What are your best heat tolerant tomatoes?
- Do you have any Persian type cucumbers?
- What are spinach substitutes I can grow in the summer?
- What are the best carrots for storage?
- What are your most drought tolerant blueberries?
- What are the best carrots for clay soil?
- What are the best carrots for containers?
- What are the best baby carrots?
- What are some of the horticulturalists' favorite vegetables?
- What impatiens are resistant to Downy Mildew?
- Do you have a squash that is vine borer resistant?
- What are some easy to grow flowers for full sun?
- What are some easy to grow flowers for shade?
- What are some flower options for wet areas?
- What are some flower options for dry areas?
- What are the best flowers to attract hummingbirds and bees?
- What are some deer resistant flowers?
- What are some container friendly flowers?
- What are some vine plants?
- What are some northern perennial flowers?
- What are some southern perennial flower options?
- What are your best all around tomatoes?
- What are your best wilt resistant tomatoes?
- What are your best blight resistant tomatoes?
- What are your best nematode resistant tomatoes?
- What are your best low acid tomatoes?
- What are your best high acid tomatoes?
- What are your best container tomatoes?
- What are your best juicing tomatoes?
- What are your best tasting tomatoes?
- What are your best canning tomatoes?
- What are your best tomatoes for sauce making?
- What are your best Campari substitutes?
- What vegetables grow quickly?
-
Seed Starting
- What tips do you have for seed starting?
- How do I thin my plants in a seed starting set?
- How many plants should be in each cell of a seed starting set?
- What are are the dimensions of Superseed Seed Starting tray 8 XL cell?
- What are the dimensions of the SuperSeed Seed Starting Tray 36 cell (96515)
- How much water should be in the bottom tray of the seed starting tray?
- Do you have any tips for expanding the Super Growing Pellets?
- How do I get my seeling ready to be planted outside?
- When should I remove the heatmat?
- When should I remove the lid (dome) on my seed starting kit?
- Do I shell the peanuts before planting?
- Do I remove the netting off the coir pellets when I plant them in the garden?
- What does direct sow (garden sown) mean?
- How long do I leave my grow light on?
- What are the dimensions of the SuperSeed Seed Starting Tray, 16 XL Cell (93412)?
- What are the dimensions of the XL ultimate Growing System (96089)?
- Which side of the self watering mat goes up in the Ultimate Growing System?
- What are the dimensions of the 72-cell Ultimate Growing System (96004)?
- Is your coir buffered?
- Do I need to wash the coir before using?
- What is the best fertilizer for seedlings?
- Why didn't my seeds germinate?
- If I cannot use all of my seed, how to I store them?
- Why did my seedling just bend over and die?
- What do I do about white mold on my soil?
- Why are my seedlings leggy (spindly)?
- Can I leave my grow light on for 24 hours?
- When should I remove the heat mat?
- Why does the lid on my grow kit not fit tightly?
- Which color side of the self-watering mat should be up?
- What is the pH of your coir?
- What is the coir made from?
- Why aren't my coir pellets expanding?
- What seed starting accessories do you recommend?
- Seed Starting Indoor/outdoor Guide
-
Gardening 101
-
Gardening FAQs
-
Garden Question Library
- Why is my 'Big Mama' tomato leaves curled?
- Are the tires of the Ultimate Gardener Cart (99103) pneumatic?
- Where is Sea Magic manufactured?
- What is Sea Magic (99004) made from?
- Do you have the directions for Sea Magic 99004?
- Do you have any self-pollinating cucumbers?
- What are some plants that tolerate rocky soil?
- Will the 12 in 1 garden bed get too hot in the summer or in hot climates?
- What are the assembly instructions for the 17" Tall 42" Round galvanized garden bed?
- What comes with the Worm Factory 360?
- What are the dimensions of the Adjustable Frost Protection Kit (99968)?
- When do I havest beans?
- What kind of support do beans need?
- When is the best time to plant beans?
- Can I get more information on the Crimson Star Goji Berry (22311)?
- Do you have the instruction for how to use the Burpee Enhanced All Purpose 5-5-5 plant food?
- Do you have the instructions on how to use Burpee Enhanced Tomato + Edibles 8-4-4?
- My kohlrabi did not form a bulb can I still eat the plant?
- Why does the kohlrabi bulb taste hot?
- Why is the kohlrabi bulb cracking?
- Why is my kohlrabi bulb woody?
- Do you have instructions on the Deluxe LED Glow-N-Grow Light Kit?
- Do you carry Cucamelon seeds?
- How long does it take to see the potato plants grow?
- What is the difference between male and female cucumber flowers?
- What were some common Kitchen Garden Vegetables from the early 1900's?
- Do I need two varieties of figs to get fruit?
- Why are my carrots pale yellow?
- How deep does a pot need to be to grow carrots?
- Why do my stored carrots taste bitter?
- What is the the average first and last frost date for my growing zone?
- Do you have directions of the Burpee clock?
- Do you have spinach that does not have oxalate crystals?
- What are the Dimensions of the Round Garden Bed?
- Do you have the instructions for attaching the Tomato Cage Extender to a Tomato Cage?
- What are the dimensions of the Mr. Spin Compost Tumbler?
- What are the dimensions of the Ms Tumbles Compost Tumbler?
- When should I start my Amaryllis?
- What is the care for Wintergreen plants?
- What is the care for the Lawson Cypress?
- What is the care for the Lemon Cypress?
- What should I never compost?
- How do I keep the greenhouse clean?
- What type of flooring do you recommend for your greenhouses?
- What is the snow load capacity of the Riga Greenhouse?
- How does the Automatic Window Opener work in your greenhouses – does it need electricity?
- What kind of ventilation is provided in the Riga Greenhouse?
- How long does it take to assemble the Riga greenhouse?
- What is the after care for Amaryllis?
- What are the assembly instructions for the 12 in 1 raised bed?
- How to grow Amaryllis.
- What comes with the 12 in 1 Garden Bed kit?
- What are the dimensions of the new 12-in-1 raised bed?
- Why are there two different seeds in the seedless watermelon packet?
- Do you have instructions for the Pro Series Cages?
- How do I store Canna bulbs for the winter?
- How do I store Caladium bulbs?
- How do I store tuberous Begonias bulbs for the winter?
- Do you carry Lisianthus seeds?
- What are the names of the onions in the set collection?
- Is the tomato and annual or perennial?
- How to store an elephant ear bulb for the winter.
- How to store Dahlia bulbs for the winter.
- How to store Gladiolus corms for the winter.
- Can I overwinter my elephant ear inside as a housplant?
- If I am expecting a frost, what should I do?
- Why are my tomatillos sour or bitter?
- Do the seeds of Nasturtium need special care before planting?
- What does Genetically Modified Organism (GMO) mean?
- Can I plant strawberries where I planted tomatoes last year?
- What are the ingredients in the Burpee Booster?
- What is a "sour" soil?
- What is a "sweet" soil?
- Why did my lisianthus arrive with the flowers cut off?
- What are inoculants for beans?
- When do I cut back the asparagus ferns for the winter?
- How old are your asparagus roots (crowns)?
- Why are my garlic bulbs for planting so small?
- Can I plant my garlic if it's sprouting when it arrives?
- Why did my kohlrabi not form a bulb?
- Will Echinacea bloom the first year from seed?
- What does thinning mean?
- Which flowers are edible?
- How do you prechill Columbine?
- Why is my white cauliflower turning green, yellow or off color?
- How do I harvest pumpkins?
- How do I sanitize a container?
- How many seeds per cell should I plant?
- How do I plant seedless watermelon?
- What vegetables are safe for dogs to eat?
- What plants are toxic to my pet?
- Why does my fig tree have 2 different kinds of leaves?
- What should I compost?
- What are the benefits of adding organic matter to my soil?
- What are these white spots on my tomato leaves after transplanting?
- How much can I expect from my tomato plant?
- What are suckers and how do I remove them?
- Can I grow tomatoes in a container?
- How should I store my sweet potatoes?
- I can't plant my sweet potatoes right away. Can I hold them?
- My sweet potatoes arrived wilted. Are they dead?
- How can I reduce pungency when using raw onions?
- How do I store whole peeled onions?
- What is the best way to store onions?
- How many cups of chopped onion will a medium onion yield?
- How do I reduce tearing when cutting an onion?
- Do you have the soil tester instructions?
- Do you have a MSDS for vermiculite?
- Do you have a MSDS for Bonemeal?
- Do you have an MSDS for the potting soil?
- Do you have an MSDS for Bloodmeal?
- What should my soil pH be for my vegetables or herbs?
- What should my soil pH be for my flowers?
- When do I harvest eggplant?
- Why do my bean plants have flowers but no pods?
- Why do I have no flowers on my bean plants?
- Are your bean seeds treated with inoculants or fungicides?
- Can I move my asparagus after planting?
- How many plants do I need for a family?
- How can I get that white asparagus I see in stores?
- Are the red asparagus berries edible?
- Do I need male and female plants to get asparagus?
- What does the season mean for blueberries?
- Can I grow container varieties of blueberries in the ground?
- Are there seedless blueberries?
- Do I need to do something special to grow blueberries?
- When will I get fruit from my blueberry plant?
- Can I grow hydrangeas in containers?
- Why are my hydrangea flowers turning green?
- Why isn’t my hydrangea blooming?
- How do I change the flower color of my hydrangea?
- Do hydrangeas make good cut flowers?
- Why are my zinnias tall and thin with smaller flowers?
- Do I need to stake my zinnias?
- How do I condition my cut zinnia flowers?
- Can I grow zinnias as a houseplant?
- Should I start my zinnias indoors or outdoors?
- How long do sunflowers bloom?
- How many flowers does each stem of the giant sunflowers get?
- Why are my sunflower seeds hollow?
- Are any sunflower seeds toxic?
- What direction do sunflowers face?
- Can I grow Morning Glory in a container?
- Are Morning Glory plants or seeds toxic?
- Why are my Morning Glory plants not blooming?
- Can I start Morning Glory seeds inside?
- What is the difference between seed dahlias and tuberous dahlias?
- Can I start dahlia tubers inside?
- What pollinators do dahlias attract to the garden?
- How do I get the biggest flowers on my dinner plate dahlias?
- Do I need to deadhead my dahlia plants?
- Where should I put cosmos in my flower bed?
- Does cosmos attract beneficial insects to my garden?
- Can I use cosmos as a cut flower?
- Can I start cosmos inside?
- Why hasn’t my cosmos bloomed?
- Can I start my bean plants indoors?
- What is the best region to grow broccoli?
- Why does my broccoli have yellow flowers and no broccoli?
- Why won’t my Romanesco broccoli form a head?
- When should I sow broccoli in the fall?
- Why did my broccoli not form a head or formed a tiny head?
- Can corn be started indoors?
- Why do I have spotty germination on my Sh2 corn?
- Why is my corn leaning over?
- Why don’t my ears of corn have kernels?
- Why did my On Deck corn not produce ears?
- Why is my cucumber have a bitter or poor taste?
- Why do I have lots of leaves but no flowers on my cucumber?
- Why do I have flowers but no fruit on my cucumber?
- Why did my green cucumbers turn yellow?
- Why are my cucumbers curved or deformed?
- Can I hold my garlic until next season?
- Can I plant garlic from the supermarket?
- Why are my tomato leaves curled in on themselves?
- Why is my garlic not bulbing?
- Can I directly eat the garlic I received?
- Can I grow garlic in containers?
- Which type of garlic is best for my growing zone?
- Why did my lettuce seed not germinate?
- Why won’t my iceberg lettuce form a head?
- Why did my lettuce produce a tall stem and flower?
- My lettuce is very bitter (inedible). Why?
- Can I grow lettuce inside or hydroponically?
- How many onions do I get per plant or set?
- Why are my onions not bulbing?
- Can I grow onions over winter?
- How long will my onions store?
- Can any onion be harvested as scallions?
- What is your hottest hot pepper?
- Why is my hot pepper not hot?
- Why is my pepper green and not red?
- Can I grow peppers indoors?
- How are my plants pollinated indoors?
- Do I need divide my mini-tubers into “eyes” before planting?
- Are your mini-tubers certified disease-free?
- How many potatoes do I get from every mini-tuber?
- Do I need to cut off the flowers from my potatoes?
- Can I grow potatoes from the supermarket?
- How many sweet potatoes will I get from every slip?
- Why did I not get any sweet potatoes?
- My sweet potatoes arrived wilted. Are they dead?
- My sweet potatoes have a hollow center in them, why?
- Are the sweet potato vines I see in window boxes edible?
- What are some common tomato diseases?
- What are some common tomato pests and problems?
- Why do I have lots of leaves but no flowers on my tomato?
- Why do I have flowers but no fruit on my tomato?
- Why are my tomatoes malformed?
- How do I grow tomatoes in a really hot climate?
- What could be eating my tomatoes?
- Why does my watermelon have a bitter or poor flavor?
- Why do I have flowers but no fruit on my watermelon?
- Why are there seeds in my seedless watermelon?
- Which seeds are the watermelon pollinator plants?
- What is the difference between a determinate and indeterminate tomato?
- What are good companion plants?
- What are good companion plants for my zucchini?
- Why do my tiny fruit turn brown and fall off my zucchini?
- Why do my zucchini have flowers but no fruit?
- Why does my zucchini have only male flowers?
- How long will winter squash store?
- If my squash is near my pumpkins, will I get mixed fruit?
- Why is my spaghetti squash green and not yellow?
- Why is the center hollow of my watermelon?
- Can I direct sow tomato seeds?
- When should I start my tomato seeds?
- Which seed starting set should I use for my tomato seeds?
- What soil should I use for seed starting?
- Can I use topsoil or garden soil to start my seeds?
- How deep should I plant my tomato seeds?
- How long does it take for the tomato seeds to sprout?
- What is the best temperature to start my tomato seeds?
- Should I use a heat mat with my tomato seeds?
- What is the germination rate of tomatoes?
- Why is the seed stuck to the leaf?
- Should I prune (sucker) my tomato plants?
- Why are the bottom of my tomatoes turning brown?
- Why do my tomato plants have large leaves that don’t look like tomato leaves?
- Can I plant my tomato transplant deeper than they were in the pot?
- What kind of fertilizer should I use on my tomatoes?
- What kind of soil should I use in pots (containers)?
- When do I harvest pumpkins?
- How do I store pumpkins?
- How do I harvest cucumbers?
- What kind of fertilizer should I use on my cucumbers?
- What are some plants that help repel mosquitos?
- Why are my tomatoes cracking?
- What is the difference between summer and winter squash?
- When do I harvest winter squash?
- How do I know when spaghetti squash is ready to harvest?
- How do I store seeds for next year?
- How long does it take for peppers to turn red?
- Why did my lettuce produce a tall stem and flower?
- Are your seeds treated with inoculants?
- Do you carry a soil inoculant?
- What plants can I use soil inoculant on?
- Why are my red peppers green?
- Why do my squash plants have only male flowers?
- How do I prune blackberries?
- How long does it take for my dormant plants to leaf out?
- How far should I plant raspberries from blackberries or wild berries?
- Do I need more than one variety of strawberries to get fruit?
- What is the difference between an annual and a perennial?
- Why is my ‘Nikko Blue’ hydrangea turning pink or purple?
- Why is my ‘Masja’ Pink hydrangea is turning purple or blue?
- How do I tell my corn is ready to harvest?
- How do I harvest corn?
- When is my garlic ready to harvest?
- How do I harvest garlic?
- How do I tell when my cantaloupes are ready to harvest?
- How do I harvest cantaloupes?
- How do I tell my watermelons are ready to harvest?
- How can I know that my onions are ready to harvest?
- How do I harvest and store my onions?
- How do I harvest winter squash?
- My spaghetti squash is green. Is there a problem?
- What plants come back year after year?
- How do I start sunflowers?
- Will my green pepper ripen if it was removed from the plant?
- How do I make my cut flowers last longer in the vase?
- Should I start sunflowers inside?
- What vegetables tolerate being near a walnut tree?
- Why do plants die near a walnut tree?
- What Annual flowers tolerate being near a walnut tree?
- What are pelleted seeds?
- How do I harvest asparagus?
- How do I harvest potatoes?
- What perennial flowers tolerate being near a walnut tree?
- When do I harvest sweet potatoes?
- How do I harvest Sweet Potatoes?
- When are Tomatillo ready to harvest?
- How do you harvest tomatillo?
- Why do my carrots taste soapy?
- Why do my tomatoes have tough skin?
- Why are the tops of my tomatoes remaining green?
- How do you treat your seeds?
- What is the best pH for a vegetable garden?
- What is the best pH for blueberries?
- Do you have any corn that is resistant to corn earworms?
- How do you control cutworms?
- Which garlic should I grow in the fall?
- Which garlic produce scapes?
- Should I remove the flowers from my garlic?
- Are the garlic flowers (scapes) edible?
- How do I reuse a container for next year?
- Can I reuse the potting soil in my containers this year?
- Which side of the seed is up? Does it matter which side it up?
- What does deadheading mean?
- Pests
-
Diseases/Disorders
- Why did my Echinacea flowers turn green and are deformed?
- What flowers are resisitant to Aster Yellows?
- Why is the center of my tomato white or green?
- Why do my tomatoes have a sunken spot on the side?
- What is this white side on my pepper?
- Why does the top of my tomatoes remain yellow (orange)?
- Why is the bottom of my tomato fruit deformed?
- Ask a Question
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Garden Question Library
- Retail Inquiries
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About Burpee
- General Company Questions
-
Customer Service FAQs
- Do you have blank order forms?
- When do you switch to the next seasons' seed?
- What methods of payment do you accept?
- Can you ship your products internationally?
- Can you provide a phytosanitary certificate?
- Can I preorder a “currently unavailable” item?
- Where can I find my zone?
- What is restricted to my state?
- What are your product guarantees?
- How do I get a refund or replacement for my damages product?
- How can I return my order?
- When will your fall plants be shipping?
- How can I request a catalog?
- How can I place an order?
- How can I check my ticket status?
- Does your company offer donations?
- Do you ship to Canada?
- Do you sell GMO or Round Up ready seeds?
- Can I change the shipping date for my plants?
- Are you owned by Monsanto?
Related Articles
- Why is my 'Big Mama' tomato leaves curled?
- Are the tires of the Ultimate Gardener Cart (99103) pneumatic?
- Where is Sea Magic manufactured?
- What is Sea Magic (99004) made from?
- Do you have the directions for Sea Magic 99004?
- Do you have any self-pollinating cucumbers?
- What are some plants that tolerate rocky soil?
- Will the 12 in 1 garden bed get too hot in the summer or in hot climates?
- What are the assembly instructions for the 17" Tall 42" Round galvanized garden bed?
- What comes with the Worm Factory 360?
- What are the dimensions of the Adjustable Frost Protection Kit (99968)?
- When do I havest beans?
- What kind of support do beans need?
- When is the best time to plant beans?
- Can I get more information on the Crimson Star Goji Berry (22311)?
- Do you have the instruction for how to use the Burpee Enhanced All Purpose 5-5-5 plant food?
- Do you have the instructions on how to use Burpee Enhanced Tomato + Edibles 8-4-4?
- My kohlrabi did not form a bulb can I still eat the plant?
- Why does the kohlrabi bulb taste hot?
- Why is the kohlrabi bulb cracking?
- Do you have instructions on the Deluxe LED Glow-N-Grow Light Kit?
- Do you carry Cucamelon seeds?
- How long does it take to see the potato plants grow?
- What is the difference between male and female cucumber flowers?
- What were some common Kitchen Garden Vegetables from the early 1900's?
- Do I need two varieties of figs to get fruit?
- Why are my carrots pale yellow?
- How deep does a pot need to be to grow carrots?
- Why do my stored carrots taste bitter?