It may seem brutal, but thinningseedlings is essential for the health and production of flowers and vegetables. Learn how and when to do it with our guide. Nobody likes to thinseedlings.Don't seed too thickly. Two to three seeds per pot is sufficient. Some gardeners carefully separate the seedlings and replant the extras in other pots. How to ThinSeedlings Correctly. Seedlings are somewhat delicate little plants. Avoid damage to the plants that remain, and space them out properly with these thinning tips Why Do Some Seedlings Need Thinning? In the wild, plants have only one goal in life: to produce the seeds that will form the next generation. How & When To ThinSeedlings Step-By-Step Guide. Thinningseedlings is important in order to grow strong and healthy plants. How to ThinSeedlings Before Transplant. Close up of a hand pulling out a small plant from the dirt. Thinning your seedlings is a quick and easy way to reduce crowding. If you're starting seeds indoors, you can take the chance to thin multiple seedlings that have germinated in the same cell while you're potting up your seedlings. As you thin, you are also choosing the most viable seedlings. This allows you to focus on the strongest and healthiest plants. Importance of Thinning Plants and Seedlings. Thinning is important to make sure each plant develops to its potential size, shape, and quality. What is thinningseedlings, and why do I have to do it? Usually when you grow plants from seed you place two or three seeds in each hole in the ground in case a few don’t grow.