Square vs. Round pots

Dunno if helpful / relevant but on commercial sites I see pots listed with different side-angles, so presumably alternatives are available and desirable. No idea what the criteria would be for choosing one over another.

Presumably taller pots (such as the Tom / Clematis pots) need to have shallower angled sides, otherwise they would finish up at a point at the bottom!

 

Agreed, stability comes into it, but surely that mostly applies to large pots, many of which I find too narrow at the base, especially large outdoor planters.
Mostly designed to look good but are inpractical.
Greenhouse "growing on" pots dont usually need to be very stable, do they?

 

I agree, that's rarely a problem.

Carrying a 2ft square gravel tray filled with 50+ newspaper pots, 4" tall, is precarious to say the least!

but when pots are jambed in tight against each other none of them is going anywhere ...

... the only time I struggle with normal pots is when the top is excessive and makes the thing top-heavy. Trailing plants with plenty of "trail" - even if trained into a Beehive on top - have that problem too. I just stand them in a pot a couple of sizes bigger and fill the void in between with heavy gravel.

 

I'm gradually changing to square pots, they are more convenient space wise for my propagator. I also use trays for smaller seeds including the six cell trays where seeds need a 'medium' tray to start off, however these aren't as deep as single pots and I find I often have to pot them on when the seedlings have grown on.

The round pots I still have tend to be used for potting on larger seedlings but I only use those in the greenhouse, or for when the plants are being passed on to someone else. I won't replace them when they have gone.

The larger pots, 2 litre upwards, I prefer to be round as I find them easier to handle especially when they have the weight of young shrubs in them.

 

I have just gone solely to square pots. I've tried to get myself organised and have 9cm square heavy duty pots and several gravel trays which are 54cm square, I can get 36 pots nice and snug on a tray. Great! So now I can cart about pots of plants on a tray in and out of my greenhouse (being delivered soon ) with ease. Only one problem, the greenhouse door is only 52.7cm wide
At least I can have a tray of plants in the back of my van and all the pots will support each other, as long as I can stop the pots on the outside from falling over.