These articles suggested that if I were to place these two varieties close together, the plants would share nutrients under the soil surface, the tomatoes would have enhanced flavor (since flavor comes from the soil), and the aroma from the basil would help confuse insects seeking tomatoes to eat.
Basil is very easy to grow and can be squeezed in near your tomato plants. Some say that, planting basil within 18-inches of a tomato plant can actually improve the flavor of the fruit and repel many insect pests. Basil is an annual herb and requires a warm, sunny spot to grow.
Basil: Not only does basil enhance the flavor of tomatoes, but it also repels insects like mosquitoes and flies.
Basil repels tomato hornworms as well as aphids, flies, mosquitoes and spider mites, so it's worth growing in your garden beds as well as near your doors and windows. Like tomatoes, basil benefits from a deep, thorough watering.
Mint should be kept in a separate garden plot or pot. Basil with Rue: Basil and rue should not be grown together since they can stunt each other's growth. Fennel and Cilantro: Fennel and fennel don't go along. Chemicals from fennel may be released, which prevent cilantro from growing.
Plants to avoid
Thyme and sage have different growing requirements than basil. Thyme needs drier, sandier soil, and basil needs moist, nutrient-rich soil. Fennel and common rue attract pests that could infect your basil plant and stunt its growth. Plus, common rue can also make basil leaves taste bitter.
Basil performs best in full sun—that means 6–8 hours of direct sunlight per day—which is necessary for the best possible flavor and fast growth. If you're growing indoors, place the planter in a south or west-facing window. North and east-facing windows just won't cut it!
It is not only a flavorful ingredient in Italian, Chinese, French, and Thai cuisine, but it is also a fragrant, ornamental plant for gardens and containers. Easy to grow and tasty to eat, basil plants will add color and an aniselike fragrance to all flower and herb gardens.
Basil also acts as a good insect repellent for flies and mosquitoes. Very useful using fresh leaves rubbed on the skin. Eucalyptol. According to research conducted by Kansas State University, this compound is effective in eliminating bugs from the kitchen and repelling cockroaches and weevils.
Basil is versatile and grows well in a wide variety of conditions. You can count on a decorative pot growing inside to do just as well as when you're growing basil outdoors, as long as your growing conditions are the same.
Tomatoes. Cilantro will protect tomatoes by deterring pests, and tomatoes will provide much-needed shade and cool soil during summer. The downside is they have different nutritional needs, and tomatoes might be affected by the nitrogen-rich soil that cilantro requires.
No, vinegar doesn't kill insects but repels them. For an effective mixture, make a 50/50 mixture of vinegar and water. It should keep regular insects such as flies, mealybugs, centipedes and millipedes away from your plants. Do not spray directly on plants.
Make a Deterrent spray
“You can use a homemade garden spray to manage the hornworm population and a useful and effective recipe for hornworms is a mixture of cayenne pepper, water, and soap,” says Kantor.
Spent coffee grounds can contribute to healthy soils by adding organic matter and nutrients. The spent grounds are composed of nitrogen-rich proteins and contain potassium, small amounts of phosphorous, and other essential plant nutrients including calcium, iron, magnesium, and zinc.
It is called companion planting. An extra bonus of doing this is that you can conveniently harvest both at the same time. Basil is the number one herb for tomatoes, but other herbs complement tomatoes as well: bay, chives, dill, marjoram, oregano, parsley, rosemary, savory, tarragon, and thyme.
Basil thrives in moist soil, so check moisture levels often and water deeply once the top inch becomes dry. As basil plants grow to 4 to 6 inches tall, pinch off the topmost branches to promote more side shoots and a taller plant overall. Be sure to pinch off blooms to prevent your plant from going to seed.
Basil plants initially grow one central stem. Once they are reach 6-8 inches tall, pinch the central stem back by half and about 1/4 inch above the leaf axils. This will force the plants to branch and grow more leaves. As the plants keep sending out new branching stems, continue to pinch them back in the same manner.
Basil in garden beds usually doesn't need water as often as basil that's grown outdoors in pots. A good rule of thumb is to water basil in culinary gardens about once every 1 to 3 days in hot weather and every 5 to 7 days in cool weather, but this can vary depending on weather patterns and other factors.
Basil is a tropical herb, and plants need sun and heat to thrive. Give it a spot that receives six to eight hours of sun daily, except in the South and Southwest, where afternoon shade is a must. Basil needs moist, nutrient-rich soil that drains well.