Chimney bellflower, Campanula pyramidalis, is considered to be a perennial, but it is better grown as a biennial. The plant, hardy to USDA zone 3, grows 3 to 4 feet tall and spreads 3 feet wide. It produces stems with pyramid-shaped racemes and bell-shaped flowers in shades of blue or white. Chimney bellflower is a host plant for white mold, which can devastate flower and vegetable gardens. The flower is also susceptible to attack from several pests.
Plant chimney bellflower in well-drained soil. Mix in a generous amount of mulch or compost to amend the soil.
Allow for proper air circulation. Choose a site that is open and space the plants according to their size at maturity.
Give the bellflower about 1 inch of water once a week; this prevents the soil from remaining soggy. Water in the morning to allow the plant to dry during the day.
Remove plants infected with white mold immediately. Burn them or discard them; do not add them to a compost pile.
Remove and replace garden soil that has white mold.
Control weeds. According to the University of North Dakota Extension, "Many weeds are hosts to the white mold fungus when ornamental hosts are not present. A micro-pore weed barrier laid over affected ground can prevent the dispersal of spores from germinating sclerotia."
Use a fungicide. Fungicide acts as a preventative and will not remove existing fungus. Contact your local Extension office for advice on which fungicide to use.
Watch for aphids on chimney bellflower. Aphids can damage plants and transmit viruses from plant to plant in certain vegetable and ornamental species, according to the University of California Agriculture and Natural Resources Program. Treat aphids with a chemical or organic pesticide.
Treat mites on bellflowers by spraying them off the lower leaf surfaces using water. Larger infestations need to be treated with a pesticide.
Spread a 2-inch-wide border of gritty sand or diatomaceous earth to prevent damage from snails and slugs. Treat an attack by scattering slug pellets or removing the pests by hand.