Thunbergia grandiflora (Blue Trumpet Vine)

How to grow Thunbergia grandiflora (Blue Trumpet Vine) in NZ

Thunbergia grandiflora (Blue Trumpet Vine) grows best in full sun to partial shade with fertile, moisture retentive, free draining soil. Choose a warm, sheltered position protected from heavy frost and cold winds. Prepare the soil with compost before planting and provide a strong trellis, fence, pergola, or other support for the vigorous stems. Water regularly while the plant establishes and during prolonged dry periods. Apply a balanced garden fertiliser during spring and summer to encourage healthy growth and flowering. Mulch around the root zone to conserve moisture, keeping mulch clear of the lower stems. In colder regions, additional winter protection may be required.

Thunbergia grandiflora (Blue Trumpet Vine) care tips

Thunbergia grandiflora (Blue Trumpet Vine) benefits from regular watering, feeding, training, and pruning to keep its vigorous growth manageable. Water deeply during dry weather and apply a balanced fertiliser during spring and summer to support flowering. Train young stems onto their support and trim back excessive growth as needed to maintain the desired shape and size. More substantial pruning can be carried out after flowering or during the warmer growing season if the plant becomes overgrown. Remove dead or damaged stems and maintain good airflow through the canopy. Protect plants from severe frost, particularly while young, and keep the root zone mulched to conserve moisture.

Thunbergia grandiflora (Blue Trumpet Vine) size, spacing, and growth rate

Thunbergia grandiflora (Blue Trumpet Vine) is a fast growing and vigorous climber that can reach approximately 6 to 10 m tall when given suitable support and favourable conditions. It can also spread several metres, so adequate room should be allowed for mature growth. Space plants around 2 to 3 m apart when using several specimens for screening or along a large structure. Regular pruning can be used to restrict size and maintain a tidy framework. Because mature growth can become dense and heavy, supports should be strong and securely installed. Its rapid growth makes this plant particularly useful where quick vertical coverage and privacy are required.

Landscaping uses for Thunbergia grandiflora (Blue Trumpet Vine)

Thunbergia grandiflora (Blue Trumpet Vine) is an excellent landscaping climber for creating lush screening, tropical character, and bold flower colour in warm New Zealand gardens. Train it over pergolas, arches, sturdy fences, trellises, or wall supports where its vigorous growth can be accommodated. It is particularly useful for softening large structures, creating privacy, or forming a dramatic flowering backdrop around outdoor living areas. The large lavender blue flowers contrast beautifully with the dense green foliage. Thunbergia grandiflora is best suited to spacious, sheltered sites where regular pruning can keep the growth controlled and where protection from severe frost is available.

Why buy Thunbergia grandiflora (Blue Trumpet Vine) from The Plant Company?

The Plant Company is NZ's most trusted plant nursery, supplying quality plants for gardens and landscaping projects throughout New Zealand. Our Thunbergia grandiflora (Blue Trumpet Vine) plants are carefully grown and selected for health, vigour, and strong establishment. Strict quality standards and careful packing help ensure plants arrive in excellent condition and ready to grow. When you buy from The Plant Company, you can order online with confidence and benefit from expert growing advice, fast delivery, and free shipping on qualifying orders over $150.