How do I grow big tomatoes

First, where do you live? If you are in the northern hemisphere, now is not the time to start tomatoes unless you are using a grow light over the winter. Next choose a variety that is bred to be large. Here is a link to help you out! Nothing like home grown tomatoes. 🍅

https://en.m.wikipedia.org/wiki/List_of_tomato_cultivars

As Naomie said, where do you live? I am in Minnesota, and probably the largest tomatoes I can grow are Big Boys. As early in the season, (Memorial weekend for us up North), get your tomatoes in the ground. Plant them deep, at least up to the bottom leaves or pluck some off and plant deeper. Keep watch for a frost attack. Cover the plants with an old sheet if there is danger of a sudden frost.

Keep them watered daily for about 2 weeks. Water them deeply. After that, watering weekly should be enough, and don't forget fertilizing. I like to use a slow release fertilizer, applied when planted.

You will want to watch for Japanese Beetles, (an invasive species) and squash them as you see them. Or you can spray them with a dish soap/water mixture.

Hey Susan, big tomatoes aren't all they're cracked up to be. Sometimes the little ones taste better.

Put eggs shells around plant andplant food.

Hi Susan, Start with a good soil combo. I use one-third soil, one-third manure, and one-third sand. Purchase a few different kinds of tomatoes. Maybe a couple early girls (they will bare first). A couple medium size tomatoes (like bigger boys, better boys or celebrity) will bare mid-way thru the season. And finally the huge tomatoes (like heirloom or beefsteak) will bare later in the season. Water every day with a soaker hose for 15 to 20 minutes Water the soil, not the leafs. Tomatoes are made of mostly water. Pollination is the last piece of advice I can give you. If you don't see insects and bees in your garden, go out and pollinate it yourself. It's easy, just lightly jiggle the stalks of the plants. Plants that don't get pollinated will produce 15% - 20% of their capability while plants that do get pollinated will produce 90% - 95% of their capability. Wishing you well.