Hypericum perforatum · Perennial
Root rot: Ensure the soil is well-drained and avoid waterlogging to prevent root suffocation and decay.
Honey fungus: Improve soil drainage and remove infected plant material; infection is rare but serious if it occurs.
Leggy growth: Plant in full sun or partial shade and prune back hard in spring to maintain a compact shape.
Slugs and snails: Use physical barriers like copper tape or organic slug pellets to protect young plants.
Vine weevil: Apply systemic insecticide drenches or biological controls like nematodes to soil in pots.