Start Heat-Loving Veggies in Late Spring
Time your planting for warm soil and air to get the most out of tomatoes, peppers, and squash. Start seeds indoors early for a head start, but go direct with squash for best results.
What you need
- Sterile, soilless seed-starting mix
- Containers with good drainage
- Bleach
- Grow lights
- Plastic wrap or bags
Steps
- Sanitize your containers with a 1:9 bleach-to-water solution before filling them with sterile, soilless seed-starting mix. Good drainage is key.
- Start tomato and pepper seeds six to eight weeks before the expected last frost. Keep the temperature between 65 and 75 degrees Fahrenheit for optimal germination.
- Cover containers with plastic wrap to keep things moist until sprouts appear. Once they emerge, provide 16 hours of light daily using grow lights placed 2 to 3 inches above the plants.
- Gradually expose seedlings to outdoor sunlight and conditions over one to two weeks. This prevents shock and helps them adjust to the garden environment.
- Move plants outdoors when air temperatures hit around 60 degrees at night and 70 degrees during the day. Plant tomatoes deep, up to the first set of leaves, to encourage strong roots.
- Sow squash seeds directly into the garden when soil reaches at least 70 degrees Fahrenheit. These robust plants handle the transition better than transplants.
- Water thoroughly after planting and check soil moisture levels daily to ensure the plants stay hydrated during their establishment phase.
Why it works
Why start indoors?
Starting seeds indoors gives you control over the environment, leading to stronger plants. It provides a necessary head start for heat-loving veggies to mature before cooler weather returns.
Why direct seed squash?
Squash is robust and handles outdoor conditions well. Direct seeding avoids the stress of transplanting, which is ideal for crops that establish quickly in warm soil.
Why sanitize and use sterile mix?
Using sterile mix and sanitized containers prevents harmful pathogens from attacking tender seedlings, promoting healthy growth from the start.
Why harden off?
Gradual exposure prevents transplant shock. It ensures plants are prepared to thrive once they are fully committed to the outdoor garden environment.
Related on Gardeners Bible: Plant Fall Bulbs for Spring Color, How to Plant Spring Bulbs for a Full Season of Color, Sow Fast-Fall Vegetables in October for Spring Harvests, How to Divide Perennials in October.
If it goes wrong
Spindly seedlings
If plants look leggy, the grow lights may be too far away. Keep them 2 to 3 inches above the foliage to ensure proper light intensity.
Poor germination
Check that the temperature stayed within the 65 to 75-degree range and that moisture was retained with plastic coverings during the initial sprouting phase.
Regional timing conflicts
If it is late in your region, focus on transplants for tomatoes and peppers rather than direct seeding.
