The annual UC Marin Master Gardener Tomato Market is our major fundraiser of the year. The proceeds go to supporting educational programs at schools and community gardens, as well as public seminars and other educational opportunities throughout Marin. Find out more about the upcoming Tomato Market, our organization, and just about anything else you might want to know about tomatoes on the Marin Master Gardener website.
The Tomato Market is in late April, but you might have to wait a few weeks to plant your tomatoes. It is best to wait until you are sure the danger of frost has passed, and nighttime temperatures are in the low to mid-50s before you plant. You can keep your plants in a protected place outdoors to harden them while you wait.
Make sure your soil is well prepared. In-ground and raised bed planting areas should be well-amended with nitrogen-bearing compounds such as compost. If you like to plant in containers, replace last year's soil with a reputable, well-draining potting soil, washing the containers first with soap and water or a bleach or alcohol solution.
Plant the tomatoes in your sunniest location, protected from strong winds. Tomatoes require at least six hours of sunshine daily. More sun, more tomatoes! Place your plants in the soil up to the lowest leaves on the main stem, handling them carefully. This will bury all the tiny hairs on the stem, eventually becoming roots.
Water your new tomato plants frequently, not allowing them to dry out. When the fruit starts to set (little tomatoes showing up under the withering flowers) slow down on the watering, but do not allow the soil to dry out below about three inches. Don't let the leaves of your tomato get wet - use drip irrigation if possible.
Support and prune your tomato plants to allow light and air to enter the interior. This should increase fruit yield and help prevent disease.
You can use your favorite organic tomato or vegetable fertilizer, but wait until the flowering and fruit set are well underway. As always, follow the instructions on the product carefully!
You will know when a tomato is ready when there is a slight give when you gently squeeze it. A ripe tomato will come off the stem easily. Allowing the fruit to ripen on the vine will give you the best flavor. Store your tomatoes in a cool spot, but not in the refrigerator, since cold temperatures can adversely affect the flavor.
By Wendy Irving, April 13, 2024