There is just one Campanula which is grown as an indoor plant. Campanula Isophylla is a training plant that has small heart-shaped tooth-edged leaves and star-shaped flowers. There is a white-flowered form Campanula Isophylla Alba and one form that has hairy variegated leaves and darker blue flowers Campanula Isophylla Mayi.
Germination Temperature (°F)
Campanula likes to have moist roots. Water daily in Summer and keep soil just moist in Winter. It likes lime in tap water.
Apply standard liquid fertilizer once every 2 weeks starting 6 weeks after potting and continuing until the flowering season ends.
Keep plant in 5 inch pot and renew top inch soil in Spring.
Sow seeds on surface of seed compost and keep seed tray in a lit place.
Take 2 inch long tip cuttings each with 3-4 pair of leaves from old plants just as new growth appears in early Spring. Dip cut ends in rooting powder. Gently insert each cutting about 1/2 an inch into moistened equal parts of peat moss and perlite, enclose the pot in a plastic bag and keep it warm in medium light. Cuttings root in 3 weeks and can be moved into potting mixture for adult Campanulas.
Campanula is ideal for use in hanging baskets and pots. The many slender stems will trail down naturally or else they can be trained upwards on a trellis.
Cut back straggly woody plants in early Spring. Cut above the first pair of leaves from compost, just above the leaf joint. To make an upright bushy plant, pinch out the tips from the main stems as they grow.
Although Campanulas like plenty of moisture, fungus disease especially gray mold sometimes occurs. If this happens, a fungicide will kill the fungus.
Campanulas should have bright light with or without some direct sunlight at all times. Keep out of very sunny window. Indoor Campanulas should be given the coolest position in Summer.
Good feature plant for cool, well-lit position on table or windowsill. Also useful in hanging basket.
Spray weekly in Summer unless in flower. In hot weather stand pot on saucer of pebbles almost covered in water. Pot base must not touch water.
Loam based #1 compost.
Watering is necessary when transplanting, but be careful not to over water.