Free garden planner — save plants, plan beds, and get sowing reminders for your spot.
Sign up freeDahlia 'Penhill Watermelon'
flower
Bees
Bumblebees
Butterflies'Penhill Watermelon' is a cultivar of dahlia (Dahlia, family Asteraceae), a tuberous tender perennial grown for its showy, long-blooming flowers from midsummer to first frost. Like all dahlias it thrives in full sun and rich, well-drained soil and is propagated from tubers or cuttings. Lift and store tubers over winter in cold climates.
🐛 Prone to: Slugs, Aphids, Thrips, Caterpillars, Spider mites.
Attract Ground beetles, Hoverflies, Lacewings, Ladybirds, Parasitic wasps, Minute pirate bugs, Predatory mites to keep them in check — plant African MarigoldGood, AngelicaFair and AniseGood nearby.
🌼 Beneficial companion — draws Hoverflies, Ladybirds that help control Aphids, Thrips on neighbouring plants.
Rich, fertile, well-drained soil kept evenly moist but never waterlogged; slightly acidic to neutral pH (6.5–7.0). Feed with low-nitrogen fertiliser and stake taller types. Lift tubers after first frost or mulch heavily in mild winters.
Dahlia 'Sandia Spirit'
flowerA fellow Asteraceae — similar growing habits to Penhill Watermelon
