PRIME TIME FOR PRIMULA 
For those of you who grow primroses, polyanthus or cowslips, this is a good time to lift and divide mature or ageing plants. 
If you do that every second or third year, your primulas will stay young, healthy and full of flower. 
When the plants have almost finished flowering, use a fork to dig them out of the ground. 
Nigel Colborn says that this is good time to lift and divide mature ageing plants.

UK-garden expert says for those who grow primulas use a fork to dig them out
Remove any spent flower stems and shake off as much of the soil as you can. 
As the plants' rhizomes become easy to see, gently break some of those off or cut them away with a knife. 
Find and keep rhizomes which have a few healthy roots plus a single rosette of leaves at one end. 
Plant them individually, either in pots with good quality growing medium, or in a sheltered and weedfree part of the ground.

They'll be small, so mark where they are. 
Splitting primulas now gives those tiny offshoots an entire growing season to develop into large, healthy plants. 
Those will be perfect for planting out next autumn for a super spring show in 2023.
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Cover them at night when low temperatures are forecast.

If you keep them in shallow boxes or trays, those are easy to cover with horticultural fleece (pictured) if necessary
It's too early to plant frost tender seedlings and non hardy plants outside. 
Frost is still possible until late May — or June in cold regions.

Tender plants fresh from a greenhouse must be toughened up for an outdoor life. 
The easiest way is to place your plants somewhere outside which is well-lit, but sheltered. Cover them at night when low temperatures are forecast.

If you keep them in shallow boxes or trays, those are easy to cover with horticultural fleece if necessary.
LAST RITES FOR DAFFODILS
If you want to divide clumps of daffodils, replanting bulbs, the rules say do that in late summer.

But dormant bulbs can be impossible to find
With such an early and mild spring, daffodils and narcissus gave us a wonderful show. But now we're left with an aftermath of lank, dismal foliage. For a good show next year, those untidy leaves must remain untouched.
The bulbs need to transfer valuable nutrients from those, to store in the dormant bulbs. If you want to divide clumps of daffodils, replanting bulbs, the rules say do that in late summer. But dormant bulbs can be impossible to find. So you can lift and divide them now, replanting with great care.
PLANT OF THE WEEK: RHODODENDRON IMPEDITUM
Rhododendrons cannot be true blue, but this one gets close.

Native to Western China, Impeditum grows as a small, dense shrub with tiny evergreen leaves
Rhododendrons cannot be true blue, but this one gets close. Native to Western China, Impeditum grows as a small, dense shrub with tiny evergreen leaves.
In late spring, those are almost blotted out by vast numbers of tiny flowers whose petals are a gorgeous blue-purple. Being so compact, this one is perfect for a roomy container. Ericaceous compost is vital.