If growing in rows, give plants plenty of room. Plants within each row should be about 18 inches apart. Different varieties may be allowed closer plantings or need more than 18 inches. These hungry plants like lots of food, like; nettle, Kannah-Besem, comfrey etc feeds.
Rows are planted 2 meters apart, and if lots of tomatoes are desired, another mixed row can be added. Before they grow in their row [either by direct sowing or planting], pre-plant it with mustard or/and field/broad beans, and fertilize the soil with a liquid feed.
Air moves free and plants stay healthy and breathe well, as the atmosphere stays ‘sweet’ from the space. They can be utilised as protector and defence plants, plant things like kohlrabi, cauliflower + other cabbage family members, auto-flower Kannah-Besem etc which do not grow too big. These plants being protected can be harvested to make room for the tomatoes when they need it.
When planting out tomato plants, dip them in a liquid feed of erbs or other plants, and do not plant them out before hard frost has gone for the season. Straight away water them with a watered down feed [nettle/Kannah Besem, comfrey or other will do as well]. Plant them deep, and make sure the lowest flowers are not above a hand’s breadth above the soil.
Plants which are really tall can be planted at an angle so the flowers are still within a hands breadth of the soil.
They can be tied to support, like a strong stake, for taller, slimmer plants or grown ‘wildly’ for bushy, low plants.
Now the plants are growing, under-sow them with marigold, and / or mustard. Both act as partners and eventually cover.
Keep all leaves of the plants, as these are needed for energy (do not remove unnecessary leaves, however, if leaves cover fruit, then they may be removed).
If growing with support nip off various side shoots from the axils of the leaves. Bushy plants can be attained by nipping off the main tip.
If growing in greenhouses, or blocks, follow the principles as above, for feeding, planting, support, and also space plants appropriately. In greenhouses/glasshouses it is possible to support from above with string etc.