When Should I Transplant Seedlings?

Question

I bought one of those mini greenhouses where you have the little peat disks that expand, you plant the seeds, put the top on, and it steams up and sprouts the plant. My cosmos and Red Sunflower Have grow so tall they will no longer fit into the greenhouse. Should I seperate all the seedlings? Is it alright to put them in a deep flower box or should it be shallow?

Also how tall should sweet William be before you take it out?

My plants will be going outside into a garden. I have cosmos, lilys, red hot poker, poppies, red sunflowers, foxglove, sweet william, babys breath, bleeding heart, ect. Most of these are in the mini greenhouse. I am in Kentucky and latley it had been warm for days then turn cold, so I don't know when the last frost is going to be.

What do you mean by two sets of leave. Like four leaves total on all stems? Each stem right now has two leaves.

Answer 1

prop up the lid to get some air circulation. keep out of drafts or else you could have some damping off (stems will rot if there is too much humidity x sudden cool air. the next day, take the lid completely off. this will prevent sudden change of temperature) when you see tiny white root hairs poking through the peat pellet, it is time to plant each seedling individually into individual pots. plant them right up to the bottom leaves. (this is a very important part of transplanting seedlings. often seedlings get spindley and will lay over and die. so plant them deep as carefully as you can. now let them grow on in a sunny window for a few days. water daily with 1/2 strength fertilizer (ulness your potting mix already has fertilizer in it) when you put them out doors for the first time, make sure you only leave them outside for a couple of hours each day untel they get used to being outside. the breeze will strengthen their little stems, and the full sun will make them grow quicker. after a about a week, you can leave them outside, as long as there is no frost at night, and you have them in a sheltered location. deep or shallow box does not matter

Answer 2

as a general rule of thumb about when to transplant is when then seedlings have two sets of leaves on them. as for your question as to what to put them in depends on what you are going to do with them. i personally would use a deeper one to allow the roots room to spread. the sweet williams can go out after the last heavy frost of the year depending on what area of the country you live in. let me know what you are going to do with the plants and i will let you know more about what to do with them and what to plant them in

Answer 3

The most important thing is to plant your seedlings when there is no danger of frost. You might try contacting you local weatherman, seed store, or agricultural extension service.