Tough call. Overcrowding might affect the yield and possibly the health of the plants. Some gardeners do keep a few clumped together, but I haven't heard of ten together. It would also depend on how closely they are clumped (less than 1 inch between stems, or 3 to 5 inches between, etc.).
Since the plants will likely grow much larger, it might be best to thin them now, even though they are a foot tall. You might try removing most of them, leaving 1 to 3 plants together. Keep the healthiest plants, and preferably, the ones furthest apart from each other. Do not pull the thinnings up though, or they might injure the roots of the other plants (which are fragile). Use pruning shears to cut each stem off at the soil line, being careful not to injure the stems or leaves of the plants that you are keeping. Just leave the roots of the thinned plant(s) in the soil. Good luck!
Tough call. Overcrowding might affect the yield and possibly the health of the plants. Some gardeners do keep a few clumped together, but I haven't heard of ten together. It would also depend on how closely they are clumped (less than 1 inch between stems, or 3 to 5 inches between, etc.).
Since the plants will likely grow much larger, it might be best to thin them now, even though they are a foot tall. You might try removing most of them, leaving 1 to 3 plants together. Keep the healthiest plants, and preferably, the ones furthest apart from each other. Do not pull the thinnings up though, or they might injure the roots of the other plants (which are fragile). Use pruning shears to cut each stem off at the soil line, being careful not to injure the stems or leaves of the plants that you are keeping. Just leave the roots of the thinned plant(s) in the soil. Good luck!