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Hydrangeas about to steal the show

by Brian Minter

Virtually every well-tended garden is now going through its cycle of summer colour, but a certain flowering shrub is just around the corner, preparing to steal the show. Hydrangeas, next to roses, are perhaps the most common deciduous flowering shrub in West Coast gardens. The 'macrophyfla' or 'garden Hydrangea,' was introduced to England in 1736, and since then a whole series of exciting new varietles have been developed for the home garden.

When folks ask me to recommend a good vine for a shady north wall, my first choice is the climbing Hydrangea, 'anomala petiolaris'. This deciduous, fast-growing vine has four inch long, dark, heart-shaped glossy leaves. lt has aerial rootlets that cling to virtually anything standing still, and the plant itseif will stretch to 20 feet or more, if left untrimmed. Its foliage appears quite early in the spring and lasts well into the autumn. In my opinion, it almost qualifies as an evergreen vine.

The real feature of this attractive vine, however, is its large, flat white flower clusters, which grow to six inches across and resemble the lace-cap varieties. This Hydrangea is hardy to minus -25 C, which in surprising because of its lush appearance. It's a winner in any garden and will tolerate some sun, but the foliage is far richer in a more shaded location.

The white flowering Hydrangea you see in fall gardens is most likely the 'P.G.' variety, which is short for 'paniculata Grandifiora'. You've probably seen some in tree forms as many have been grafted that way. It is quite easy to select one strong branch and train it into a tree form. Believe it or not, this Hydrangea is Praire hardy, tolerating temperatures of minus -35 C. Given time, the plant can become almost a tree, stretching up to 12 feet in height, but most folks like to keep them trimmed back to around six feet to conform to most garden situations. Its massive, pendulous cone-shaped flowers appear in mid-July and often last until late September, when they take on a pinkish hue. The foliage of this fine garden plant also turns a rich bronze in fall, so it is a colourful accent in your autumn garden.

'Little Lime', one of the hot newer varieties that turns cream then multi-coloured, is a shorter cousin I love for those sunny but more compact locations. The most compact of all is H.p. 'Bombshell', growing only three feet high and wide and blooming from July through to frost with stunning pure white blooms.

'Angel's Blush' is another new variety that comes out white, then immediately turns pink and holds that beautiful pink to the end. The show stealer, however, has to be H.p. 'Vanilla Strawberry,' with its stunning white flowers that are almost .immediately infused with red, creating a 'wow' sensation.

'Lace Cap' Hydrangeas have certainly drawn the most interest during the past few years, they are called 'Serrata' or 'Lace Cap' because a cluster of sterile fiowers in the center are surrounded by large florets of traditional Hydrangea blossoms. The effect is charming and in shady locations they seem to outlast the 'macrophylla' or common varieties. Like the big-leafed Hydrangeas, however, the blossoms will turn a beautiful sea-blue in a acid solids and pink or reddish-purple in chalk soils.  Remember: you can change their colour adding lime to keep them pink or aluminum sulphate to make them blue. There are now white 'Lace Cap' varieties that look classy elegant in any setting, and they do not change colour.

One of the lesser known Hydrangea varieties is the 'quercifolla,' or 'oak-leafed,' Hydrangea. This handsome shrub has rather la leathery leaves resembllng oak leaves, an grows to about six feet high. This is a great plant for heavily shaded areas because creamy white fiowers, which appear in June brighten up those dull spots, and the foliage which turns a bright scarlet-crimson in fall is really outstanding. Unfortunately, this oak leafed variety is often quite hard to locate in nurseries. Most Hydrangeas are very versatile, but they prefer moist soil and bloom far longer with some shelter from the intense afternoon sun.

Article courtesy of:
Minter Gardens Minter Gardens

Exit #135 Highway #1, Chilliwack, BC, Canada   V2P 6H7

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Jul 2012  Hydrangeas about to steal the show  Minter Gardens 
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