A few weeks ago I planted four tomato seeds in each of fourteen Solo party cups. Most sprouted and I’ve already snipped away the extras leaving only two sprouts to continue growing. Snipping makes more sense than pulling the tiny plantlets up. There’s no chance of disturbing the remaining roots if you snip the sprout off near the soil.
Today I will choose the sturdiest plant in each cup and snip off the other. I also will add more soil to the cup, topping off near the rim. Did you know that tomato plants develop more roots along the stem if you plant them deep or add more soil?
Here’s a great article in the Spruce with good tips on growing excellent tomatoes:
Growing Strong Tomatoes