Flowers

Halfhardy plants will tolerate some chill but are likely to be killed by late frosts. This group includes marigolds, zinnias, salpiglossis and bedding dahlias.

For better flowers, it is worth adding wellrotted compost and a light dressing of bone dust to the ground where they are to grow. Work into the top 20cm of soil before planting.

Phlox plants should now be a mass of shoots. A little blood and bone worked in around the plants will ensure a good display in late summer.

Tulips and narcissi should be left as long as possible before lifting, cleaning, then replanting or storing. Foliage must not be removed until it has turned yellow.

Dahlias may still be planted and old clumps of tubers lifted and broken up for replanting. Stake when planting to avoid damaging the roots later.

Greenfly is a common problem on roses. Spray with soap solution, which will not harm bees, or with a commercial product.