Now you can find ripe flavorful tomatoes during colder months growing right in your greenhouse garden!
Growing tomatoes in the greenhouse is similar to growing tomatoes outside, just with a few extra considerations.

Containers: Growing plants in containers means different water requirements than when the plant is in the ground. Tomatoes require regular watering to prevent misshapen tomatoes. Containers dry out more quickly than the ground, so make sure to monitor the moisture level of the soil. The easiest way to check the moisture level is to use the original hand tool, your hand! Stick your finger in the dirt up to the first knuckle; if the soil is dry, it is time to water.

Humidity: The humidity level inside a greenhouse is higher than outside. Due to higher humidity, the frequency of watering may need to be reduced. It is better to water more deeply with less frequency, than with more frequency and less water.

Temperature: If you are growing tomatoes inside the greenhouse, keep in mind that they typically will not set fruit over 90 degrees or under 50 degrees Fahrenheit. In the wintertime, do not expect a large harvest, since lower temperatures means the plants grow more slowly.

Pollination: Since there are no bees inside the greenhouse to do it, you will need to pollinate the tomato flowers. Use a chopstick or other short slender stick to tap the branches with flowers on them. Tomatoes self-pollinate, so the tapping will cause the pollination to occur.

Space: Greenhouse space is limited, so keep that in mind when selecting your varieties of tomatoes. Small, bushy tomato plants are more compact and work well in a greenhouse environment. If you choose an indeterminate, or vining, tomato plant, training the plant up a trellis will help save valuable space. When the plant is young, select the main vine and prune the others. Tie a string to the rafters of the greenhouse and with a fair amount of slack, stake the other end in the tomato pot. As the vine grows, loosely coil the string around the vine.

Propagation: I highly recommend growing tomato plants from seed that have resistance to common tomato diseases. In tight quarters, diseases spread more easily. For that reason, think long and hard as to whether or not to bring in plants from outside sources. My greenhouse contains only plants I have grown from seed.

With these tips, your greenhouse can be a more productive tomato grower! Good Luck!

Back to Main Greenhouse and Gardening Articles Directory