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New plants: Hibiscus Flower Tower Series

Ideal for small gardens, these three narrow, upright Hibiscus are the first of their kind. They grow well in pots, make a great hedge, and provide sculptural statements in sunny borders

Most tree mallows (Hibiscus syriacus) reach about 1.8m in height and width after 10 years, and continue to grow to an ultimate size of around 3m high and wide.

Enter this ground-breaking trio of tree mallows: the Flower Tower Series. Instead of maturing into a rounded shape, these new cultivars develop a pyramidal form. A two-year-old containerised plant is likely to reach 98cm high with a 44cm spread; eventually maturing at 3m high by only 80cm wide.
 
Flower Tower Hibiscus provide a long succession of sterile flowers through summer and autumn
The Flower Tower Series comes in three tempting colours. Flower Tower Ruby ('Gandini van Aart Ruby') is a rich pinkish red, with a blood-red eye to the flower. Flower Tower White ('Gandini van Aart') is a stunning pure white, but perhaps the prettiest of all is Flower Tower Purple ('Gandini Santiago'), with bicolored flowers in reddish pink, with a rich reddish purple zone at the throat that becomes feathered towards the edges.

Why does each variety have two different names?

Flower Tower is the trade name under which these varieties are sold in the UK. However, each variety must also have a registered botanical cultivar name. For example, 'Gandini Santiago' is the offcial cultivar name for the trade designation Flower Tower Purple (or Purple Pillar in the US). Retailers may give either or both names, but they are the same plant!

All three Flower Tower Hibiscus have a few short petals filling out the centre, and all are sterile. Since they produce no seed, the plants put all their energy into flowering.
 
From a chance find on a Spanish nursery to our gardens
Hibiscus Flower Tower White
Hibiscus Flower Tower Purple
The first Flower Tower Hibiscus, Flower Tower Purple ('Gandini Santiago'), had a chequered route to our gardens. It was first spotted in 2002 by Andres Santiago on the nursery where he worked in Girona, Spain. A large number of Hibiscus had been grown from seed, and Andres noticed that one plant was a little different from the others.

It had a more pronounced double flower, in a new colour, and most importantly, the plant had developed an upright, pillar-like habit. Andres took cuttings to propagate this unique new sport (a plant, or part of a plant, with a different appearance resulting from a mutation).

The nursery subsequently closed, but by this time Andres’ sport was being grown at the Gandini nursery in Italy, where it was used as a rootstock onto which other varieties were grafted. Its full potential was rediscovered by visiting Dutch growers, who took it back to The Netherlands for a formal trial. The qualities of Andres' sport were recognised, and the sport was named 'Gandini Santiago' or Flower Tower Purple.

Ten years after the initial discovery, a sport with pure white flowers was found on a container-grown plant at the Dutch nursery. This became Flower Tower White.

Finally, at the Dutch nursery in 2018, a seedling producing ruby-pink flowers with a cherry-red eye was discovered in a production field of Hibiscus plants. The seedling’s parent plants are unknown. This, the third in the trio, was named Flower Tower Ruby.

Hibiscus Flower Tower Ruby
All three sports have the same distinctive, upright growth, all are hardy down to -25C, all attract bees and butterflies, and none of them need pruning to retain their shape.

Where can I buy the Flower Tower Series of Hibiscus?
Hibiscus Flower Tower Purple
Hibiscus Flower Tower White
All three Flower Tower Hibiscus are available from RHS Plants, Thompson & Morgan and an increasing range of other nurseries. Flower Tower White is available from Hayloft.
 
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