Have you heard? Knowing the last frost date in your area is crucial for starting your spring vegetable garden. Perhaps you’ve heard this advice as many times as an Adele song on the radio, but you’re having trouble finding a good planting date based on a calendar guide. Even natives have mistakenly planted too early or too late in the season. We have a few tips regarding soil temperature to get you warmed up (pardon the pun) for planting season.
Soil Temperature Tips You Can Implement Now
– If you’re new to gardening, try cold tolerant and hardy vegetables first – think broccoli, carrots and collards. This leaves more wiggle room for mistakes, or an unexpected late frost. If you’d like to learn more about what to grow, check out our post on Frost Tolerant Plants.
– Be patient and wait for optimum soil temperatures. (the payoff is worth it!)
– Learn how to take a correct soil temperature (see our guide below).
– Be prepared for the chance of an unexpected late frost. Store a blanket, or have another method for protecting plants from freezing temperatures handy.
– Consider using organic compost in lieu of store bought fertilizer. It will enrich your soil with vital nutrients, and it acts as a natural pesticide and soil conditioner.
– Strongly consider using mulch to stabilize soil temperature, especially in the warmer months. Mulch will also increase moisture levels, suppress weed growth, and safeguard against erosion.
Check out, if you’d like:
Here’s a handy list of desired soil temperatures for a variety of vegetables and herbs. (This list includes the minimum, optimum, and maximum soil temperatures for growing from seed. Be sure to also pay attention to the letters “b,” “c,” and “d” next to each vegetable, as “b” indicates a hardy vegetable for direct seeding, and the “c” & “d” signifies a tender vegetable for direct seeding.) Our Humble Seed Garden Planner also gives valuable insights and specifics for successfully planting 22 popular vegetable varieties.
4 Simple Steps To Using A Soil Thermometer
1 Buy an inexpensive probe thermometer: These are available at local gardening centers or online. The most cash-friendly thermometers have a glass bulb and a strong metal point, and they work just fine.
2 Find the recommended depth of your seed: Plan on checking the soil at that plant depth. If you’re planting a variety of seeds, then plan on checking at least 5-6 inches deep.
3 Make a pathway for the thermometer: Use a screwdriver to pilot a hole so that the thermometer will not break in hardier soils.
4 Follow Directions: Use the instructions on the thermometer package for the most accurate reading. Take multiple measurements by reading the temperature at different points of the day, including sunny and shaded times.
*Friends, what are your tips for checking and using soil temperatures for direct seeding?
Humble Seed specializes in premium garden seed kits that are packaged and themed for convenience and ease. We are dedicated to providing the highest quality heirloom, non-GMO, non-hybrid, and organic seed varieties to those who choose to start from seed. We’re also proud to say we have taken the Safe Seed Pledge!