I'm well known for my lists. If it's not written down it doesn't get done.
* Plant out pots of bulbs into gaps between other bulbs and emerging herbaceous perennials.
* power wash patio and terrace.
* fill bottom of hanging baskets with polystyrene.
* Leave cornus to establish some more this year. Next year begin coppicing.
* in May cut back taller sedums to make sturdier plants.