I could use a few 'deep' pots.(pic).

young codger

The pot in the photo is a 3LT size. I think this deep shape is referred to as a rose pot. I could do with about half a dozen or so.

I occasionally find rooted trees growing in the garden. By the time I see them, they have a root that is much longer than a standard shaped pot could accommodate.

The tree now growing in the pot was discovered only yesterday. I had to bend the last 5" of the root at a right angle, even to get it in this deep pot but it was fine.

I don't mind used pots, and I've looked on e bay, but nothing yet. I welcome suggestions

BenCotto

This company is local to me and provides excellent value for money

https://www.theplantman.net/new-page-2#!/Commercial-Pots/c/64254244

Though they provide a delivery service it might be through their own vans so would only work for you if you lived near Market Harborough.

Buttercupdays

That's a horse chestnut - is your garden big enough for one?

I've got one, grown from a conker, it's got a few years under its belt now and is promising to be a lovely tree, but it's planted well away from the house, near the neighbouring field boundary and I have several acres to choose from. Though quite a bit of it is bog...

BenCotto

This company sells rose pots. They have an eBay site as well.

https://elixirgardensupplies.co.uk/

BobTheGardener

That's where I get mine @BenCotto 👍

Athelas

Many garden centres have a large bin where customers drop in used pots. Obviously you can buy rose pots as above, but maybe have a rummage if you have a garden centre nearby

StephenSouthwest

I tend to keep random young trees in compost bags till such time as I find the place to put them in the ground...

Blue Onion

What about florist buckets?  

Lyn

I’ve got several of those flower buckets, from Morrison,  they tape them together and sell for a pound,  not sure they’re doing that through this COVID malarkey but worth an ask if you’re in a SM that sell flowers. 
Very good for tomatoes if you haven’t got room to plant them out as you can drop them in very deep. 

madpenguin

Buttercupdays said:

That's a horse chestnut - is your garden big enough for one?

I've got one, grown from a conker, it's got a few years under its belt now and is promising to be a lovely tree, but it's planted well away from the house, near the neighbouring field boundary and I have several acres to choose from. Though quite a bit of it is bog...

You can always grow a Horse Chestnut as a bonsai.
Can be a challenge as the leaves are naturally large and take a few years to get them smaller.
Here is one (not mine!) which is 58 years old and been 'in training' for 10 years.