The Gardening Year

Watch out for

Aphids: Squash by hand or spray with a strong jet of water; use insecticidal soap if infestation is severe.

Red spider mites: Increase humidity around the plant and spray with water or horticultural oil to dislodge mites.

Powdery mildew: Improve air circulation and avoid wetting foliage; treat with a sulphur-based fungicide if necessary.

Scale insects: Scrape off visible scales with a soft brush or cotton bud dipped in methylated spirit.

Root rot: Ensure pots have drainage holes and allow the compost to dry slightly between waterings.