Plan · field guide
How to Grow Tomatoes from Transplant to Harvest
Tomatoes are the number one crop in home gardens, and for good reason. Few things beat a ripe one off your own plant. But most beginners lose plants to three things: a late frost, uneven watering, and no support. Get those right and you will pick ripe fruit all summer. Here is the clear path from transplant to harvest.
Some links on this page are affiliate links. If you buy through them we may earn a small commission, at no extra cost to you. We only point to seeds and gear we would use ourselves. See our full affiliate disclosure.
Plant after the frost
Tomatoes hate cold. A single frost can kill a young plant overnight. Wait until your nights stay above 50 F before you set them out. If you plant too early, you risk the whole crop.
When you do plant, plant deep. Bury about two thirds of the stem, right up past the lowest leaves. The buried stem grows new roots along its length, which gives you a stronger plant that handles heat and dry spells better.
Give them room and support
Crowded tomatoes get less air and more disease. Space slicing tomatoes 24 inches apart in the row, with rows 48 inches apart. That airflow keeps leaves dry and cuts down on leaf spot and blight.
Add a cage or stake the day you plant, not later. A loaded tomato plant gets heavy and tips over, and pushing a stake in after the roots fill out tears them up. Set the support first, then guide the plant into it as it grows.
Water evenly
Tomatoes want steady moisture. Give them about 1 inch of water a week, more in real heat, poured at the base of the plant instead of over the leaves. Wet leaves invite disease.
Uneven water is the real troublemaker. When plants swing from bone dry to soaked, you get blossom end rot, that black sunken spot on the bottom of the fruit, plus split and cracked tomatoes. A layer of mulch holds moisture even and saves you from the dry-then-flood cycle.
Feed for fruit, not leaves
More fertilizer is not better. Too much nitrogen grows a big, dark green, leafy plant with few tomatoes on it. That is the most common feeding mistake.
Once the plant sets its first small fruit, switch to a feed lower in nitrogen and higher in phosphorus and potassium, the numbers that push blooms and fruit. Follow the label rate. A little, on schedule, beats a lot all at once.
Harvest
From transplant, a slicing tomato like Big Beef takes about 73 days to first ripe fruit. Counted from direct seed, plan on about 110 days, which is why most gardeners start with transplants.
Pick when the fruit is fully colored and gives a little to a gentle squeeze. You can also pick at the first blush of color and let it finish on the counter, which keeps birds and cracks from beating you to it. Once they start, check every day or two, because ripe tomatoes come fast.
Keep going
Questions, answered straight
Space slicing tomatoes 24 inches apart in the row, with rows 48 inches apart. That spacing gives each plant air and light, which lowers disease and makes picking easier.
It is a calcium problem driven by uneven watering, not a bug or disease. When soil swings from dry to soaked, the plant cannot move calcium to the fruit. Water evenly, about 1 inch a week, and mulch to hold moisture steady.
A slicing tomato takes about 73 days from transplant to first ripe fruit, or about 110 days if you count from direct seed. Starting with transplants is the faster, more reliable route.
It helps. Pinch off the small shoots that grow in the joint between the stem and a branch, and remove leaves touching the ground. That improves airflow and steers energy into fruit. Leave the main stems and the leaves that shade the fruit.
Know when it's time to plant
Give us your ZIP and we'll email you a planting checklist for your exact frost dates, this month's list right now, then once a month when sow windows open.
One email a month, only when there's something to plant. Unsubscribe anytime.