He advises: “Cut back any winter flowering or unruly shrubs that were missed last year and cut back any of your plants that were in your herbaceous borders if you left them till now.
He also recommends pruning back wisterias to around three or four buds to encourage growth of new flowers, rather than leaves.
Jack says: "With wisterias, before they start leafing up, you can see the structure of wisterias so any new growth, you can tell going back to the main stem.
Jack also warns gardening fans to "proceed with caution" if they're planning to cut back hydrangeas - but says you can do this now.
You need to cut them right back so they put on flower rather than leaf growth.
