Phoenix Palm The Phoenix Palm is impressive and holds a prestigious RHS Award of Garden Merit. It will grow 1.5m tall when restricted in containers but 5m tall with a canopy of 3m if grown naturally in glasshouse borders, which will look truly amazing. In winter, move container-grown plants to a frost-free position and keep the compost on the dry side. In mild areas plants may be overwintered outdoors if grown in sheltered borders and offered some winter protection with horticultural fleece. Palms need little pruning, in spring remove dead or damaged foliage from lower down on the trunk. Wear gloves when pruning for protection. Caution: Foliage may be irritant to skin.