ZANTEDESCHIA: Arum Lily Calla Lily

Zantedescia aethiopica, in the warmer parts of the British Isles, may be grown outdoors to bloom in summer, to be lifted indoors in autumn like chrysanthemums. Known as the Calla or Arum Lily, it is not a lily but an aroid, growing from a corm. It may be given cold house culture throughout when it will bloom early in summer, though with a temperature of 55°F (13°C), it will bloom for Easier when it is much in demand for church decoration.

The Arum Lily requires a moist situation where growing outdoors. It may be planted by the side of a pond or stream and is quite happy where submerged in water for long periods.

Indoors, plant one corm to a 6 in. (15 cm) pot; two to a 10 in. (25 cm) pot, using a compost made up of 6 parts turf loam, 1 part peat, and 1 part decayed cow manure to which is added a liberal amount of coarse sand or gravel. Plant 3 in. (7.5 cm) deep with the top of the compost 1 in. (2.5 cm) below the rim of the pot to allow for watering. Use no lime in the compost. Arums like a slightly acid soil whilst lime will encourage soft rot of the corms {Bacterium carotovorum).

The corms are potted in August and are stood out of doors until mid-September when they are moved to a greenhouse heated to 50°F (10°C) at night, 55°F (13°C) by day. As the plants will make growth quickly water frequently and from Christmas, give a fortnightly application of dilute manure water. The plants will begin to bloom by mid-March but if they appear retarded, increase the day temperature to 60°F (16°C) from early March. One plant will produce five or six blooms with a 9 in. (22 cm) long spathe of purest white on a stem 2 ft (60 cm) in length.

After flowering, place the pots on their side outdoors in a sunny position for the bulbs to ripen and take indoors again in September after topping up with fresh compost. Every two years, divide the plants and re-pot into fresh compost. The best for outdoors and a cold greenhouse is ‘Crowborough’.

07. September 2017 by admin
Categories: Featured Articles, Plants, Shrubs | Tags: , , , , , , , , , , , , , , , , | Comments Off on ZANTEDESCHIA: Arum Lily Calla Lily

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