Salvia macrophylla ‘Purple Leaf Form’ is an uncommon ornamental sage grown for its striking combination of rich purple foliage and violet-blue flowers. Native to the cloud forests of Central and South America, the species naturally grows in mild, frost-free climates. The large, textured leaves provide year-round interest where winters are gentle, while the colourful flower spikes attract bees and other pollinating insects throughout the warmer months.
| KEY PLANT INFORMATION | |
|---|---|
| Family: | Lamiaceae |
| Plant Type: | Evergreen shrubby perennial |
| Plant Colours: | Purple foliage, violet flowers |
| Flowering period: | Summer to autumn |
| Fragrance: | Aromatic foliage |
| Mature Height: | 2–3 m (6.5–10 ft) |
| Light Requirements: | Sun or partial shade |
| Water Requirements: | Moderate, free draining |
| Cold Hardiness: | –5 °C (23 °F) if kept dry |
| Difficulty: | Easy to Moderate |
Plant Type
Shrubby perennial
This is an evergreen, shrubby perennial that forms a broad, bushy framework of woody stems clothed in large aromatic leaves. Unlike many smaller salvias, it develops into a substantial shrub that offers both bold foliage and long-lasting floral displays. It is valued as much for its architectural presence as for its nectar-rich blooms, making it an excellent choice for wildlife-friendly and exotic-style gardens in suitable climates. However in the UK it is best treated as a tender perennial.
Mature Height
2–3 metres (6.5–10 feet)
Given warmth, shelter and fertile soil, Salvia macrophylla ‘Purple Leaf Form’ typically reaches 2–3 metres (6.5–10 feet)in height with a similar spread. Growth is relatively rapid during warm weather, producing long, upright stems that gradually develop a dense, rounded habit. In cooler parts of the UK it often remains slightly smaller, particularly if winter frost causes dieback or annual pruning limits its ultimate size.
Light Requirements
Full sun to partial shade
This salvia performs best in full sun or light partial shade. Plenty of sunlight encourages the richest purple foliage colour, sturdy stems and abundant flowering. In hotter climates, light afternoon shade can help prevent stress during prolonged heat. Choose a sheltered location protected from cold winds, as this helps preserve foliage through winter and reduces damage to the tender young shoots produced in spring.
Water Requirements
Moist but well drained
Provide regular watering while the plant is establishing, keeping the soil evenly moist but never waterlogged. Once mature, Salvia macrophylla shows moderate drought tolerance, although it flowers and grows far better with consistent moisture during dry spells. Rich, well-drained soil with plenty of organic matter helps retain sufficient moisture without becoming saturated, reducing the risk of root problems during wet winter weather.
Cold Hardiness
–5 °C (23 °F)
Salvia macrophylla ‘Purple Leaf Form’ is hardy to approximately –5 °C (23 °F) when grown in well-drained soil and a very sheltered position. Brief frosts are often tolerated, but prolonged freezing temperatures can damage or kill stems. In colder parts of the UK it benefits from a thick winter mulch and frost protection, while container-grown specimens are best moved into a cool, frost-free greenhouse or conservatory.
Propagation tips
The easiest way to propagate this plant is from softwood or semi-ripe cuttings taken during late spring and summer. Remove the lower leaves, insert the cuttings into a free-draining propagation mix and maintain high humidity until roots develop. Seed propagation is possible but is slower and less reliable, particularly for maintaining the distinctive purple foliage. Young plants establish quickly when planted into warm, fertile soil after the risk of frost has passed.
