A tomato is either determinate or indeterminate. That one word on the label decides its spacing, its support, and when it stops - everything else follows.
The single most useful thing to know about a tomato plant isn't a technique. It's one word on the label, and it decides the spacing, the support, the pruning, and half the harvest schedule before you touch the soil.
Determinate or indeterminate - decide here, everything follows
A determinate tomato grows to a fixed size - roughly a metre - sets most of its fruit in one concentrated window, and stops. It suits a short season, a container, sauce-making (the harvest all arrives together), and a modest cage or a single stake. An indeterminate tomato never stops: it's a vine wearing a bush's reputation, two to three metres by late summer, flowering and fruiting right up until frost kills it. It needs a genuinely tall, strong support, and pays you back with months of picking instead of weeks.
Neither one is better. But almost every disappointment comes from treating one like the other: an indeterminate plant in a flimsy wire cone has swallowed it by July and collapsed by August; a determinate plant pruned like a vine has had half its one-and-only crop cut off. The planner asks you which you're growing for exactly this reason - the spacing, the support, and the days to maturity it plans around all change with the answer.
Planting: late, deep, and not before the frost is done
Tomatoes are frost-tender and they know it. A tomato set out two weeks early just sits in cold soil doing nothing - or dies to a late frost - while one planted after the danger's past catches up and overtakes it almost every year. Start seeds indoors about six weeks before your last frost (the seed-starting guide covers the mechanics), and set plants out once frost is genuinely behind you - the planner gives you both dates for your own place.
Plant deep. A tomato is one of the few crops that roots along its buried stem, so a leggy seedling planted right up to its top leaves becomes a better-anchored plant, not a buried one.
Put the support in on planting day. That's the whole argument of the staking guide in one sentence: a stake driven in beside a mature plant spears the roots you spent all summer growing.
Water evenly, feed lightly
Most tomato fruit problems are watering problems in disguise. Blossom-end rot - that black sunken patch on the bottom of the fruit - is almost never a soil deficiency and almost always uneven watering (the blossom-end rot guide has the full story). Deep, regular watering at the base, plus a mulch to smooth out the swings, prevents more trouble than anything you can buy. Go easy on the nitrogen: an overfed tomato is a huge, dark-green, fruitless bush.
When fruit stops coming
A healthy plant that flowers but sets nothing in high summer is usually a temperature story, not a disease - hot nights interrupt the pollen. That one has its own guide, because it's the most-asked tomato question there is.
Next year: not here
Tomatoes are nightshades, and the diseases that end their season - early blight, Septoria - carry over in the ground they grew in. The corpus keeps nightshades off the same ground for three years:
PromisingDo not plant nightshades in ground that held nightshades within 3 years.
costly if ignored → warn
Mechanism: Alternaria solani (early blight) and Septoria lycopersici overwinter on tomato debris and solanaceous weeds; a 2-3 year break plus debris removal starves this inoculum. Fusarium has a very narrow host range, so rotating away from the host is effective. Verticillium is the exception: microsclerotia persist ~10 years and it infects 300+ host families, so a garden-scale rotation does not control it.
Evidence: confirmed against 5 sources in the research-based literature.
the 5 sources
Clemson HGIC, 'Tomato Diseases & Disorders', hgic.clemson.edu/factsheet/tomato-diseases-disorders (read 2026-07-11): 'tomatoes and related vegetables, such as potatoes, peppers, and eggplants, should not be planted on the same land more than once in three years.'
NC State Extension, 'Early Blight of Tomato', content.ces.ncsu.edu/early-blight-of-tomato (read 2026-07-11): 'Rotate every 2-3 years.'
NC State Extension, 'Septoria Leaf Spot of Tomato', content.ces.ncsu.edu/septoria-leaf-spot-of-tomato (read 2026-07-11): 'The fungus is known to overwinter on infected tomato debris and solanaceous weed hosts'; 'Rotate away from tomato for 2 or more years.'
NC State Extension, 'Verticillium Wilt of Tomato and Eggplant', content.ces.ncsu.edu/verticillium-wilt-of-tomato-and-eggplant (read 2026-07-11): 'The pathogen can survive in the soil without a host for up to 10 years in the form of structures called microsclerotia'; 'affects more than 300 host families.'
UMass Extension, 'Solanaceous, Verticillium Wilt', umass.edu/agriculture-food-environment/vegetable/fact-sheets/solanaceous-verticillium-wilt (read 2026-07-11): 'Verticillium wilt tends to affect a wide range of hosts and can infect many unrelated plants. Fusarium spp., on the other hand, have very narrow host ranges.'
remedy
Plant nightshades in different ground, or wait until 3 years have passed since this ground last held them. Clear and remove the old debris either way — the inoculum overwinters on it.
Read the full rule → · open in the planner ↗
The planner tracks this from your log automatically, which is the most practical reason to record where this year's tomatoes actually went.
