Tibouchina

Tibouchina, often known as Princess Flower or Glory Bush, is a plant that draws the eye and holds it. With velvet leaves and rich purple blooms that shimmer in the light, this tropical-looking shrub adds an unmistakable elegance to gardens and patios. But its exotic appearance belies an adaptable nature—when grown with the right balance of light, soil, and seasonal care, Tibouchina becomes a showstopper with staying power.

Light & Shelter: Bright but Balanced

Tibouchina needs good light to flower well, but too much harsh sun in hot climates can scorch its leaves. The sweet spot? Full sun with some afternoon shade, especially in warmer southern counties. For best results, place it in a sheltered position—protected from strong winds and cold snaps that can damage tender growth.

Top Tip: An east- or south-facing wall offers light and protection, creating a microclimate where Tibouchina can thrive.

Soil Requirements: The Importance of Acidity

This plant flourishes in slightly acidic soil with excellent drainage. Aim for a pH between 5.5 and 6.5. Heavy or alkaline soils cause leaf yellowing and poor flowering, so amend generously with organic matter or use specialist ericaceous compost in pots.

If your soil is clay-heavy or chalky, raised beds or large containers are your best bet. Add grit for drainage and blend garden soil with compost or a peat-free acidic mix to create ideal conditions.

Watering: Keep Moisture Even, Not Excessive

Regular watering is key—especially during the first year and in dry spells. Keep the soil evenly moist but allow the top inch to dry out slightly between waterings. In pots, check moisture often, particularly in warm weather.

Tibouchina is moderately drought-tolerant once established, but consistent watering will keep the foliage lush and the blooms prolific.

Feeding: Feed for Flowers, Not Just Leaves

Feed in spring and again in late summer with a balanced, slow-release fertiliser designed for acid-loving plants. For extra flower power, use a high-potash liquid feed every 4–6 weeks during the growing season.

Avoid excess nitrogen—you’ll get more leaves than flowers. If flowering stalls, switch to a tomato feed or similar to boost bloom production.

Pruning: Shape and Encourage New Growth

Prune Tibouchina after flowering or in early spring, once the danger of frost has passed. Trim back up to one-third to shape the plant, remove damaged or dead wood, and encourage bushiness.

You can prune hard if needed—Tibouchina responds well to rejuvenation cuts. For a tree-like form, remove lower stems and leave a clean, upright structure.

Regular deadheading throughout summer helps prolong flowering and keeps the plant neat.

Mulching & Seasonal Care: Nourish and Protect

Mulch in spring with compost or bark to retain soil moisture and suppress weeds. Ensure air circulation around the base of the plant to reduce the risk of mildew.

In cooler regions, overwinter Tibouchina indoors or in a frost-free greenhouse. If grown outside, wrap it in fleece during cold snaps and mulch heavily to insulate the roots. Damaged leaves after frost can be pruned away in spring.

Pests & Problems: Few but Manageable

Generally low-maintenance, Tibouchina occasionally attracts aphids, scale insects, or spider mites. Treat with insecticidal soap or remove manually. Leaf browning is usually due to water issues (too much or too little) or cold exposure.

Propagation: Multiply the Magic

Take softwood cuttings in spring or early summer. Root them in moist, acidic compost in a warm, sheltered spot. New plants establish quickly and reward you with early growth and flowering.

Design Ideas & Companions

Tibouchina makes a striking container feature or summer border plant. Pair with other acid-loving species like ferns, heucheras, or camellias. In tropical-style beds, combine with cannas, bananas, and salvias for bold contrast.

Its deep purple flowers also stand out against silver foliage or pale stone, making it perfect for terrace gardens and courtyard pots.

Final Note: A Colourful Investment

With the right care, Tibouchina brings extraordinary colour and texture to gardens large or small. Slightly tender, yes—but with just a little attention to soil, watering, and frost protection, it will flourish. Its ability to bounce back, combined with a long blooming season, makes it a rewarding choice for gardeners looking to grow something a little bit magical.