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The mullein moth caterpillars in my garden are still small, but they're guaranteed to increase in size by the day. These little critters - welcomed by wildlife enthusiasts and hated by gardeners - munch their way through verbascum, figwort

plot, the cabbage white caterpillars have joined in. A number of my calabrese plants are barely alive, having been stripped down to the leaf ribs; they're crawling with the (admittedly rather pretty) yellow and black stripy caterpillars of the large

Despite the attentions of the cabbage white caterpillars my Brussels sprouts are doing really well. I think the calabrese acted as a kind of sacrificial crop, as the cabbage whites have gone for these first, the cabbages second and the Brussels last

. The branches are bare of leaves and several of the bushes are completely defoliated. The culprits are not hard to spot: small speckled greyish sawfly caterpillars. If they keep on like this B. thunbergii is doomed.

, the first was earlier this year when I reared one from a larva. They must, in fact, be very common, because the caterpillars are all over the place. These spiky psychedelic toothbrushes are unmistakable, with their four dorsal tufts of bright yellow bristles

and hedges so we have a large population of birds. Blue tits are very beneficial for the gardener as they feed their young on caterpillars.Talking of which, it is very easy to unwittingly overwinter caterpillars in glasshouses and polytunnels. Only the other

completely different foodplants. Butterflies in the spring emergence lay their eggs on holly and their caterpillars feed on the developing buds. When these insects reach adulthood in late-summer they lay their eggs on ivy flower buds. At least

. The first is relatively straightforward: the mullein moth caterpillar. These are stripy chaps that start quite skinny, but rapidly become as fat as witchity grubs by eating verbascum leaves at a terrifying rate. I grow the gorgeous Verbascum bombyciferum

Dulwich). All ichneumons are parasitic, laying their eggs in a wide range of insects, but especially moth and butterfly caterpillars. The venom injected at the same time contains an immunosuppressant, preventing the immune system of the host insect from

by squirrels. I went to great lengths to build a butterfly-proof shelter around them to prevent attack from the caterpillars of cabbage white butterfly. Fortunately, this was a great success. But towards the end of the season the squirrels moved in