Pest identification
What's eating my geranium x oxonianum 'a.t. johnson'?
Vine weevil
Signs: Grubs devour the root system, causing sudden wilt; irregular notching on leaf edges indicates adults.
Control: Apply nematodes to moist soil in August or September; remove and destroy any grubs found when dividing.
Slugs and snails
Signs: Chewed holes in leaves and flower stalks; silvery trails on soil around the plant.
Control: Use ferric phosphate pellets, grit mulch, or a beer trap; collect pests manually at night.
Aphids
Signs: Dense colonies of soft-bodied insects on shoot tips, producing honeydew and sooty mould.
Control: Spray with a strong water jet or insecticidal soap; natural predators keep populations in check.
Keep geranium x oxonianum 'a.t. johnson' pest-free
Healthy plants resist pests best. Get the basics right:
Geranium x oxonianum 'A.T. Johnson' pests — FAQ
What is eating my geranium x oxonianum 'a.t. johnson'?
Geranium x oxonianum 'A.T. Johnson' shares the hardiness and pest profile of the oxonianum group. Vine weevil is the top underground threat, while slugs and snails target foliage especially in spring. Aphids can colonise new shoots. Its vigour means it recovers well from light damage but vine weevil needs biological control.
How do I get rid of vine weevil on geranium x oxonianum 'a.t. johnson'?
Grubs devour the root system, causing sudden wilt; irregular notching on leaf edges indicates adults. Apply nematodes to moist soil in August or September; remove and destroy any grubs found when dividing.
How do I get rid of slugs and snails on geranium x oxonianum 'a.t. johnson'?
Chewed holes in leaves and flower stalks; silvery trails on soil around the plant. Use ferric phosphate pellets, grit mulch, or a beer trap; collect pests manually at night.
How do I get rid of aphids on geranium x oxonianum 'a.t. johnson'?
Dense colonies of soft-bodied insects on shoot tips, producing honeydew and sooty mould. Spray with a strong water jet or insecticidal soap; natural predators keep populations in check.