Look out for pests such as lily beetles and vine weevil.
Nematodes are brilliant for controlling pests such as vine weevils; water the nematodes in to warm moist soil. All in one pest killers can also rid you of vine weevils and other pests such as lily beetles and aphids. For an organic, but admittedly less effective solution, squash pests as you see them!
Vine weevils are drab and brown, far less showy than brilliant red lily beetles but just as destructive because they have an ongoing cycle of procreation. At any one time there can be eggs, grubs and adult beetles all in the same patch of soil. That’s a lot of potential for damage!
The give away signs of vine weevil infestation are notched leaves caused by the adults feeding on the foliage. Plants may suddenly droop and die; when you dig them up you find there are hardly any roots left, eaten away by the horrid, maggoty looking grubs.
Be careful when you tip out old compost from pots and containers, rummage through it and search for the grubs, they are easy to spot with their pale brown heads and C-shaped cream coloured bodies.
You can easily infest a whole border by unwittingly introducing them to the soil in spent compost.
Brilliant scarlet Lily Beetles are already on the move, I’ve spotted them on a stand of Crown Imperials (Fritillaria imperialis) and there were even some on a clump of Calamagrostis. Grass isn’t normally infested so it was a bit of a shock to see the distinctive red lily beetle climbing a stem. Lily beetles leave a black slimy mess that covers their young and the grubs chomp away at stems and foliage quickly disfiguring the plants. Lily Beetles are very hard to squash because the moment they spot danger they tumble to the ground and hide.