The first thing is that Primula Candelabra need moist soil so unless you're prepared to water the pots religiously they will die. If you have a damp area in your garden they would be better there. I also think if you really want them in pots then group them into one.

Best time to put plants in when it's raining! Good luck.

Agree with Arbuthot Primula pulverulenta needs almost bog like conditions and semi-shade. We have a challenge with growing here in the ground whilst a friend who lives in Fort Augustus where there is a high rainfall almost views them as weeds! Primula denticulata also needs moist conditions so neither is suited to being grown in pots, especially if terracotta as they dry out quicker than plastic.

Possibly the best way to keep the compost moist would be to stand the pot in a saucer and make sure it always has water in it. But as MG states, terraacotta pots will tend to dry out fairly quickly.

The primulas won't like it... look for something that is happy with dryish conditions!

Ive these primulas and as said above, mine are in boggy conditions by the pond where they love it. It's started to come back double what it was last year when I planted it. I put their good growth down to the fact that when the pond is full to the top the water seeps/gently overflows into the boggy area.. Good luck with yours :))

You could even in your largest pots have different styles of plantings in them like a boggy one, one with a small rose or something etc for a different feel..

Thanks, will have a think so it's good to know that they need boggy shady conditions.