Ants
Ants march in lines up stems and branches, often to colonies of aphids. Small heaps of fine soil appear under plants or in window boxes; plants growing on a nest can dry out.
Ants farm aphids for their sweet honeydew and protect them from enemies; they like to nest in dry, loose soil.
What can you do?
- Usually just leave ants alone: they tidy up and are food for birds.
- Deal with the aphids; without aphids, the ants lose interest in the plant.
- Fit a sticky grease band around the trunk of fruit trees so ants can no longer reach the aphids.
- Move a troublesome nest by placing an upturned flowerpot filled with straw or wood wool over it; after a few days, carry the pot and the ants away.
Prevention
Keep the soil in window boxes and pots moist and tackle aphids early. Don’t use boiling water or poison near plants.
When to watch out: April–September