Transplanting Small Tree Whips

[Beaupeep]

Hi
I've been sent two small tree whips by the Woodland Trust with no real aftercare instructions. The first is a silver birch about 30cm tall, in leaf and with the root ball enclosed in black polythene bag about the size of a bank polythene coinage bag. The second is a Hazel about 60cm tall with more dimunitive leaves and again with the root all enclosed in a black polythene bag. They look like single stemmed twigs to be honest.
I'm planning to transplant both to individual pots temporarily until I can find a space in the garden. What would be the best pot size to use? What about the compost? I'm inclined to use John Innes or other soil-based given that most of them grow in fields and forest etc. Would JI number 1 or JI number 2 be best for them? I don't want to put them in too heavily fertilised soil and I'm not sure about soiless composts.

Thank you.

[bookbinder]

https://www.wikihow.com/Transplant-a-Young-Tree

[Beaupeep]

Thanks bookbinder but perhaps I'd not made clear that mine are nothing more than twigs with a rootball I can hold in one hand. The website is written for USA users with larger trees and rootballs regretfully.

[Tilly2]

Two litre pots (15cm) with John Innes no.2

[Tilly2]

Maybe a 3 litre pot for the Hazel.

[Beaupeep]

On looking into it further, they are called cell-grown saplings and look like single leaf bearing twigs of the height I've said.

[Beaupeep]

Thank you Tilly2, that was exactly the answer I wanted.

[choux]

Have you checked out the trust's website? They say to plant Nov-Mar. There is a video to show how to plant and the sample used appears similar to your description. I think you would be better off planting them straight in the ground.
https://www.woodlandtrust.org.uk/plant-trees/advice/how-to-plant/

[Chipchopper]

Most importantly, don't let them dry out!