When to Transplant Seedlings Hydroponics?

Plants should be transplanted when they have developed 2–3 sets of true leaves. Transplant is the stage that comes after propagation; it's when you move your young seedlings into your grow-out system.

How big should seedlings be before transplanting?

The general rule of thumb is that when a seedling has three to four true leaves, it's large enough to plant out in the garden (after it has been hardened off).

What month do you transplant seedlings?

Every time you dig up a plant, it loses some roots. In hot weather, this root deficit may make it impossible for a transplant to cool itself. The best times for transplanting perennials are the months when the weather is cool. Spring often works well, and fall is one of the transplanting seasons of choice.