Square plant pots have the advantage of fitting close together, so are excellent at allowing you to use all your available bench space. Square pots are also good when you’re propagating. You’re able to fit more square pots into a propagator than you would round pots, so again square pots let you make best use of the space available.
Two Wests & Elliott (UK) - manufactures and suppliers of
greenhouses, greenhouse staging, fruit cages (netting and aluminium
tubing), a wide variety of gardening equipment and
accessories.