This attractive foliage houseplant is a member of the Cordyline fruticosa group: it is of a more clump-forming habit than most of the other cultivars and bears rich green leaves which look almost as if they have been starched. They fan out from the main stem and make Cordyline ‘Glauca’ a good solid example for any foliage plant collection. Like all Cordyline, the high level of humidity required for success with C. ‘Glauca’ is difficult to provide in the average home: try grouping together several different cultivars of this enormous genus for the benefits of shared humidity.
Provide the tropical Cordyline ‘Glauca’ with a minimum Winter temperature of 18°C (65°F); an ideal temperature range is 24-27°C (75-80°F).
Grow this plant where it will receive good, bright, but indirect, light at all times: in Summer, a room which faces North will give better conditions than the rather sun-filled recesses of a South- or West-facing room.
Provide Cordyline ‘Glauca’ with plenty of water during the growing period: if the recommended growing temperatures are attained, then keep thewell moistened, but not soaked. During the remainder of the year, the compost should be just moist, with a reduction in the amount of water given in cold periods. Always use tepid water.
To provide the necessary high levels of humidity, stand the plant pot on a tray of moisture-retentive pellets: do not allow the pot to sit in the water. In addition, in conditions of very dry air, mist the plants first thing in the morning.
Established plants should be fed every other month during the growing period, using a proprietary houseplant fertilizer. Do not feed newly-purchased or recently-repotted plants for a period of six months.
Repot plants only when their roots are over-crowded and there is a likelihood of the plant becoming pot-bound: use a loam-based potting compost, especially for larger plants, which will benefit from the additional stability.
These plants are quite amenable to being – pruned back if they become too large: prune to shape, or even cut back the main stem to 7-10cm (3-4in). The plant will sprout bushily from the stump, looking much healthier and attractive; thin out the resultant stems so that you are left with only the strongest.
Poor light will affect the leaf colour.
Leaf drop: A low level of humidity, or a lack of water, results in leaf drop.
Leaf spots: Brown leaf spots indicate that the plant has been under-watered; dry and crispy spots appear if the plant is given too much direct sun.