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There are two main species of ground hugging phlox most commonly grown in our garden, both of which are native to North America — Phlox subulata and the smaller Phlox douglasii. These phlox have been selected and bred to produce many cultivars in a wide range of colours from white to blue-purple, lavender and all shades of pink to almost red.
Mats of evergreen leaves turn into colourful carpets in late spring or early summer. Several flushes of intense flowering are followed by sporadic sprinkles of blooms right through until winter. Both species are very low growing, P. subulata being the more robust of the two.
Ground covering phlox are valuable perennials for the edge of a border or to tumble down a bank or over a wall and soften any harsh lines.
Phlox subulata ‘McDaniel’s Cushion’ is one of the best performing with large deep pink blooms and a vigorous growth habit forming mats up to 2m in diameter.
There is a wide array of cultivars of both of these phlox species planted throughout the rock garden — scrambling over rocks and providing splashes of colour.
- Garden Life is produced by Dunedin Botanic Garden. For further information contact Robyn Abernethy.