Marigolds make good companion plants for tomatoes because the roots contain thiopene. Certain nematodes find this substance toxic and will either avoid it or meet more severe consequences. Dandelions are another good plant to have in your tomato patch believe it or not. Tomatoes are susceptible to fusarium wilt, which is a soil borne fungal disease and dandelions can help keep this in check.
Plant tomatoes along side of radishes, spinach, lettuce and turnips to help shade them from the hot sun. Though there is some debate, cabbage and cauliflower may benefit from having tomatoes close because they discourage flea beetles from nibbling. Some sources will contend that planting cabbage with tomatoes will hinder the growth of the tomatoes. Most gardening requires some trial and error to figure out what works best for your environment. Tomatoes are also helpful in repelling asparagus beetles.
Good plants to pair with tomatoes are basil, carrots, chamomile and marigolds but keep them separate from fennel and potatoes.
Spacing: Plant 18″ apart.
Height: Grows 4′ to 5′ tall.
How To Grow: Plant in full sun.
Outstanding Features: Good resistance to Fusarium Wilt, Verticillium Wilt, Root Knot Nematodes and several other common diseases that affect tomatoes.
Tips: Tomatoes will grow in any good garden soil that is properly drained. Good drainage is necessary to prevent “blossom-end rot”. The ground should be tilled deeply before the tomatoes are planted. The soil should also be enriched with compost, leaf mold, peat moss or commercial humus. Manure can be used, if at all, with caution. Set plants out after danger from frost has passed and plant them a bit deeper than what they were growing in their containers. If your plants are a bit spindly, plant them on their sides and cover with dirt up to their first leaves. Roots will grow along the buried stem and produce sturdier plants. To avoid wilts and other serious problems, rotate tomatoes and other related vegetables (peppers, tomatoes, eggplants) with non-related vegetables such as legumes and cucurbits (squash, cucumbers). Check out plant tags to see what a tomato variety is resistant to. Look for the designations V (resists verticillium wilt), F or FF (fusarium wilt), N (nematodes), T (tobacco mosaic virus) and A (alternaria). In addition, look for number of days until harvest (DTH) and the terms determinate and indeterminate. Determinate types (D) grow to a certain height and stop. Indeterminate types (I) continue to grow and bear fruit over a longer period of time.
Uses: Garden Vegetable/Fruit