We're offering you a Hydrangea Macrophylla Glam Rock Plants for £8.99, saving you up to 36% off Thompson and Morgan's's price of £13.99 (correct as of 15.05.2026).

Hydrangea macrophylla 'Glam Rock' – A Showstopper for Every Garden

Hydrangea macrophylla 'Glam Rock', also known as 'Horwack', is a deciduous flowering shrub renowned for its spectacular bicolour mophead blooms. Each blossom features clusters of vivid red florets with striking blue centres and lime green edges, creating a dazzling focal point from early summer right through to autumn.

• Botanical Family: Hydrangeaceae
• Mature Size: Reaches 1–1.2m (3–4ft) in height and spread, making it ideal for borders or containers.
• Flowering Period: Blooms prolifically from June to September.
• Hardiness: Fully hardy in the UK (USDA zones 6–9), tolerating frost and adverse weather.

Cultivation & Care Guide

• Soil: Prefers moist, well-drained soil rich in organic matter. For the most vivid blue tones, plant in acidic soils (pH 5.5–6.5); neutral to alkaline soils may produce more pinkish hues.
• Light: Thrives in partial shade but tolerates morning sun; avoid full midday sun to prevent leaf scorch.
• Watering: Keep soil consistently moist, especially during dry spells. Mulch annually to retain moisture.
• Feeding: Apply a balanced fertiliser in spring; use ericaceous feed if you wish to intensify blue colouring.
• Pruning: Prune after flowering by removing spent blooms and weak stems; avoid hard pruning as this may reduce next season’s flowers.

Design Tips & Companion Planting

• Borders & Beds: Plant as a colourful anchor alongside hostas, ferns, or Japanese anemones for layered interest.
• Pots & Patios: Suits large containers—perfect for patios or balconies where space is limited but impact is desired.
• Cottage Gardens: Combine with other shade-tolerant perennials for a classic English garden look.

FAQs

• When is the best time to plant Hydrangea macrophylla 'Glam Rock'?
  The best time to plant is in early spring or autumn when the soil is moist and temperatures are mild.
• How fast does this hydrangea grow?
  'Glam Rock' typically grows 20–30cm per year under optimal conditions, reaching full size in about 3–5 years.
• Does it need special soil?
  This hydrangea thrives in fertile, well-drained soil. Acidic conditions bring out the most vibrant blue shades in the flowers.