Plant of the Month November 2018

Mandevilla (Rock Trumpet)

Semi-evergreen or deciduous woody climber

Height 7 metres/22 feet

Aspect: Full sun

Frost tender, min temperature 5-10° C

Care: Moderate

Grown for its large trumpet shape flowers from late summer onwards into winter.

Want to find a Mandevilla at Reveley - look in the conservatory.

Even though this woody stemmed climber is more at home in the tropical and subtropical forests of central and south Western America and the West Indies - you can, believe it or not, grow it in the UK.  Mandevilla’s are not frost hardy, and should be grown in a conservatory or heated greenhouse to give them the year-round sunlight and full winter protection that they need.  Mandevilla’s will struggle as a houseplant because they thrive in full sun although they may need some light shade in summer to avoid leaf scorch.

Mandevilla’s can be confused with Dipladenia, which look very similar in flower and habit.  Dipladenia are more compact, whereas Mandevilla are more vigorous.  And, just to confuse you, all Dipladenia are Mandevilla

Plant in a conservatory or the greenhouse border in good general-purpose compost such as John Innes No 3 with added grit to aid drainage.  Place in full light but shade from scorching sunshine in summer.  Mandevilla’s can be repotted in early spring.  The plants will need warm humid conditions in spring to encourage the growth of the vigorous shoots which will provide that year’s flowers.

Water moderately in the growing season, then sparingly from October to February too much winter watering will rot the plants.  Mist daily in the summer. 

Established plants can be trimmed in late winter or early spring, to keep them in check, taking side shoots back to three or four buds of their permanent framework.  Prune out dead, overcrowded or weak shoots.

The most common pest of Mandevilla’s are red spider mite and mealy bugs.

Propagate by seed in spring or softwood cuttings in early summer.

The genus was named after Henry Mandeville (1773-1861), a British diplomat, based in Argentina, and gardener.  The genus was hybridised at Longwood Gardens in Pennsylvania, the popular variety “Alice duPont” was named after the wife of the founder of the gardens, Pierre duPont.

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October 2018

September 2018

August 2018

July 2018

June 2018

May 2018

April 2018

March 2018

February 2018

January 2018

December 2017

November 2017

October 2017

September 2017

August 2017

July 2017

June 2017

May 2017

April 2017

March 2017

February 2017

January 2017

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