Phlox subulata 'Emerald Cushion Blue' – Alpine Creeping Phlox (Set of 3 or 6)

Emerald Cushion Blue is an alpine phlox, a dense evergreen mat smothered in lavender blue flowers through April and May.

It grows only 10 to 15cm tall but spreads to 30 to 45cm, forming a firm cushion of needle like dark green leaves that stays green all year. In spring the whole mat disappears under flower. It is at its best tumbling over a wall or the edge of a raised bed, threading through a rockery, or filling the front of a gravel border as ground cover.

Give it full sun and sharply drained, poor to moderately fertile soil; sandy or gritty ground suits it best and it copes with dry spells once established. It asks for almost nothing beyond a light trim after flowering to keep the cushion tight. Plants arrive established in 1 litre root balls, ready to plant out or pot on.

Cultural Information

• Common Name: Moss phlox, creeping phlox
• Fully Grown Height and Spread: 10 to 15cm tall and 30 to 45cm wide
• Growth Habit: Low, mat forming cushion
• Perfect For: Rockeries, alpine gardens, dry walls, border edges, ground cover and containers
• Foliage: Dense, needle like dark green leaves, evergreen
• Flowering Time: April to May
• Planting Position: Full sun. Copes with dry soil once established and grows well in containers and wall tops
• Soil Type: Sharply drained, poor to moderately fertile. Sandy or gritty ground is ideal
• Hardiness: Fully hardy in the UK
• Maintenance: Trim lightly after flowering to keep the cushion neat. Very little else is needed
• Seasonal Interest: Spring
• Type: Hardy evergreen alpine perennial

Free UK Delivery on Every Order

All orders placed Monday–Thursday before 2pm are packed the next working day and delivered within 24 hours of dispatch.

Example: Order on Monday → packed Tuesday → delivered Wednesday.

Orders placed Friday–Sunday are packed and shipped on Monday. We don't dispatch on weekends to ensure your plants travel fresh.

How Your Plants Arrive
Every plant is individually wrapped in our plastic-free packaging and secured in a custom box designed to keep them upright and protected in transit. If anything arrives damaged, get in touch — we'll replace it.

Returns
Not happy? Contact us within 14 days of delivery and we'll sort it out. See our full returns policy here.