Azalea x
Glenn Dale hybrid azalea
SIZE/TYPE medium-sized shrub
USUAL WIDTH 0.5-1.5m
LEAVES evergreen broadleaf
COLOUR OF LEAVES light green
COLOUR OF FLOWERS combined:purple red and white
LOCATION semi-shade / partial sun
USDA zone (lowest) 6   (down to -23°C)
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Rhododendrons, azaleas, and mountain laurels
Evergreen broadleaf
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Glenn Dale is a hybrid group of evergreen azaleas that originated in the USA in 1935. The director of US National Arboretum B.Y.Morrison established a hybridizing programme whose aim was to select azaleas with large flowers, extended flowering time and sufficient cold hardiness for Washington DC area. He registered the first 440 cultivars in 1941 and the last few 11 years later. These azaleas are eye-catching plants and we offer plants which are hardy enough for Central-European climate.

Martha Hitchcock is a true sensation azalea from Glenn Dale hybrid group. This beauty bears extra large flowers that are 6 cm across, white in the throat grading to neony pink towards the margins. The flowering plant looks like a thousand of pink torches all lit up at once. It starts blooming in early June and continues for about 3 weeks. Its leaves are mid green, ovate, larger than on Japanese azaleas. They are evergreen but a large portion of foliage from inside the shrub may fall off before and during winter. It grows at medium growth rate to an airy bush.

If you don’t like the airy appearance with defoliated branches you can prune or clip them immediately after flowering to achieve a denser and more compact shrub. If so, do not use fertilizers enhancing growth rate. The size of new branches would get out hand and spoil the shape you are planning to gain. They need light, permeable soil that is acid, constantly moist (keep azaleas mulched at all times) and moderately fertile. Use fertilizers for rhododendrons and azaleas, or ericaceous plants. The best soil mix is 1/3 of peat, 1/3 of leaf-mould or lime-free compost, and 1/3 of soil from the hole where you are going to plant it. Azaleas have shallow roots, so do not plant them too deep. Glenn Dale azaleas prefer semi-shade or filtered sun. They can take full sun only for a part of the day. Hardy to USDA zone 6 (-23°C), perhaps a little more on a protected site.

Last update 17-12-2010
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Azalea x 'MARTHA HITCHCOCK' height 40-50 cm
De Luxe

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Azalea x
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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