Perennials in 9 cm pots.....go for 'em now
Many of the garden centres now have quite a range of hardy perennials in 9 cm pots.....cheap. Pot them on now and again in a month and again a month later for large perennials fit for your garden this spring and summer. They will be growing faster now than at any other time so get them potted.
(Saved some cash this year......all my perennials are growing well from cuttings taken in August/September so no need to buy more )