Here are some tips for planting seeds during hot weather.
Soak Seeds First
Soak larger or harder seeds (beans, peas, sunflowers, nasturtiums, etc.) for a few hours to overnight to speed up germination.
This helps them power through dry soil crusts.
Pre-Moisten the Soil
Water the soil thoroughly before planting—not just the surface.
Dry topsoil can bake and form a hard crust, making it hard for seedlings to push through.
Provide Temporary Shade
Use shade cloth, old window screens, or even overturned baskets for the first few days.
Keeps seeds from drying out and protects tiny seedlings from scorching.
Mulch Lightly (but Carefully)
A very light mulch of straw, grass clippings, or even burlap helps retain moisture—but avoid burying the seed.
Once seedlings are 1–2 inches tall, mulch can be thicker.
6. Water Consistently (Twice Daily if Needed)
In high heat, shallow soil dries fast. Mist or lightly water morning and evening until germination.
Avoid overhead watering in full sun
Choose Heat-Tolerant Varieties
Look for flower and vegetable types that say “heat-tolerant” or “good for summer sowing.”
Examples:
Veggies: Malabar spinach, cowpeas, okra, bush beans, summer squash.
Flowers: Zinnias, cosmos, celosia, marigolds, sunflowers, tithonia.
Sow Late in the Day
Plant in the evening to give seeds 12+ hours of cooler conditions before facing the next day’s heat.
Use Succession Sowing
In hot spells, not every seed batch will make it. Re-sow small amounts every 5–7 days to hedge your bets.