Perennials from Seed - Beginner Question!

Hello,

Tried googling this but can't find a helpful answer... This is my first year of growing perennials from seed. They are outside at the moment in a selection of 7-10cm pots. For the hardy ones, can I plant them in the ground at any time or should I wait until they get to a certain size??

Thank you!

 

Usual advice is wait till the chance of frosts is over. For most areas that will be mid/end of May. Where do you live?

Where do you have them outside and are they protected at all? If there is a sudden hard frost you could still lose them if they are just on the ground in pots.

 

Ah right, I assumed that waiting until after the last frost only applied to non-hardy seedlings.

I'm in Bucks. The hardy seedlings are on the ground against a west facing wall, unprotected. The tender ones go into the summer house overnight. Sounds like I should be putting them all inside overnight though.

 

I am in Wales, as the plants like have been out all, what passed for winter this year, I have planted mine in the ground, they are all sheltered though by a low wall, the ones in the summer house need "hardening off" leave them out over night, check the forecast for your area, if it`s not going to go very low leave them. I work on the assumption its 2nd week of April, if we get any bad weather it won`t last long, They are hardy perennials and should stand some cold, make sure you plant the tender ones where they will get some protection next "bad" winter.

 

To give a proper answer though we need to know what they are, how advanced they are and what size pots are they in?

Photos would be good too