For context I am a complete gardening novice so apologies for what may be a silly question.
I've designed a new border for our garden which I plan to plant up with a mix of repeating perineals/grasses. Ideally I wanted to plant all at once but after contacting some nurseries this seems impossible due to different propagation times and stock issues.
So, do I buy and plant in stages (wanted to avoid this til I could see plants altogether) or keep everything in pots til I have everything in? If the latter, how do I keep them at their best.