All about Hydrangeas

Hydrangea macrophylla dark blue hydrangea macrophylla veitchii Hydrangea arborescens 'Annabella'

 

Growing Hydrangea

  green wheelbarrow easy to grow Hydrangea are easy to grow and need only  minimal pruning which makes them a low maintenance shrub. They are also not so fussy about soil types and conditions and some, particularly the climbing Hydrangea, will even grow in shade. Generally speaking most Hydrangea are large shrubs from  1.5m - 3m (3-10ft) and so need a fair amount of growing space.

 Hydrangea make great border plants and are grown for their lovely showy flower heads, predominately flowering  pink, mauve, blue , cream and white.  Hydrangea are (mainly) deciduous  and a summer flowering shrub which require little maintenance, and will grow in most soils including chalk, with a preference for sun but Hydrangea will also tolerate partial shade.  In some varieties the  flower colour can be affected and changed by the pH of the soil; which is whether the soil is acid or alkaline. Growing in an acid soil the Hydrangea flowers blue and in alkaline pink; the white flowers are unaffected. Hydrangea are a woodland plant with a preference for moist but well drained soil in sun or semi shade. As a woodland plant, they are best planted with some shade and avoiding the full afternoon sun as Hydrangea will thrive in the cooler part of the garden.  As always, it is a question of the right plant right place, which means avoid planting where there is hot afternoon sun or cold easterly winds. Generally Hydrangea is tolerant of most growing conditions.

There is a very attractive climbing  form of Hydrangea, H. petiorlaris will tolerate  a higher degree of shade and can be useful to grow up a shady wall. This really is a lovely climber, relatively fast growing and so tending to be vigorous but  beautiful flowers and I have seen grown to great effect on a large semi shaded wall where it can be left to grow unchecked and form a mass of white flowers in the spring. It is self supporting but does need a reasonably large space.

There are also some  varieties of Hydrangea which have scented blooms, such as Hydrangea paniculata 'Wim's Red' and also some compact varieties H. panciulata Little lime ('Jane') and Hydrangea with beautiful delicate colours such as pink turning to white as in Hydrangea paniculata Vanille Fraise ('Renhy')

The range of Hydrangea is wide and varied, a  few are illustrated below and also on Pinterest board

Hydrangea macrophylla come in two forms: 'Lacecaps' see illustrated below a lovely delicate bloom, and 'Hortensias (mop head ) with rounder flower heads.

When selecting a Hydrangea for the garden many grow to around 3m, such as H.Paniculata 'Unique',  Serrata the popular ''Blue bird' smaller around 1.2m  and there are many Macrophylla varieties around 1.5m. a useful size for most gardens.

Pruning Hydrangea

If you are intending to prune Hydrangea, with the exception of the climbing Hydrangea H.Petiolaris see below, Hydrangea should be pruned in later winter or early spring. The climbing Hydrangea which flowers in spring should be pruned after flowering. Prune once established and with Lacecaps and mopheads (H. macrophylla) remove a few, 2/3 older stems from the based which will encourage new growth later in the spring. Leave faded flower heads on over winter.  This type of Hydrangea needs a light prune in February remove the top of the stems with last season's flower head in place and cut down to just above a green bud which will be showing by now. Do not prune harder, or lower, to do so is a mistake which can prevent the Hydrangea flowering later in the summer.

The climbing Hydrangea can be pruned after flowering to restrict it's growth cutting back long shoots. It can be pruned harder but best to stagger as if it is pruned hard all at once there maybe significantly less flowers the next year.

Hydrangea paniculata and H. arborescens need more attentive pruning, (which maybe why they are less popular) each spring prune back to a framework which means cutting back stems to a pair of buds. These varieties flower best if pruned harder so can be cut back to the lowest pair of buds which may result in the plant, post pruning, only being 25cms but you can of course leave several buds on and prune less hard.

The easiest Hydrangea to grow are the Lacecaps and Mopheads as you can simply remove the old flower heads in the spring cutting down to a pair of buds and that's it.

 

Types of Hydrangea 

hydrangea paniculata in bloom

 

Hydrangea Paniculata

This is Hydrangea Paniculata which needs some pruning  and flowers best if regularly pruned in the spring. It flowers in the late summer producing white  or cream flowers. 

Prune as detailed above to maintain flowers otherwise Hydrangea is usually trouble and disease free but comes with a size warning - they can grow quite large up to 7 meters and  5 meters wide,

 Hydrangea petiolaris the climbing Hydrangea

 

Hydrangea Petiolaris the climbing hydrangea

The climbing hydrangea Petiolaris is vigorous, which means fast growing and needs plenty of space. The image left shows how easily it covers most of a wall which means you need a big space for this and it will reward you with fantastic fresh green foliage in spring, ( it is deciduous)  and lovely delicate flowers in early summer . If you need to cover a large wall, particularly if it is  partially shady, this is a great choice  and it can be contained, to some extent, by hard pruning. 
As it is summer flowering, hydrangea Petiolaris should be pruned after it has flowered as it produces flowers on the current year’s growth.  A vigorous, deciduous climber which is fully hardy and self clinging.
 
hydrangea-macrophylla-merveille-browing-in-cap--roig-spain-310x240
Hydrangea  macrophylla

The common Hydrangea which group is divided into two groups:  Lacecaps and the Mopheads. Some varieties of Hydrangea Serra are also described as lacecaps. It is very confusing buy and plant what you like. 

Serrata 'Veitchii'

Image  is Hydrangea  macrophylla 'merveille browning'  Prune in the spring cutting down to flower buds.

Hydrangea macrophylla light blue

Hydrangea Macrophylla  Hortensias is also known as mopheadAll  Macrophylla are affected 

by the PH of the soil acid soils produce blue flowers alkaline pink. 

To be precise, a Ph of less than 5.5 produces blue flowers, more than 5.5 pink.

 

Hydrangea paniculata fading blooms

The fading blooms of Hydrangeas are very attractive and last for weeks. Left is Hydrangea Paniculata where the limey white blooms are fading through pink to pale white.

 

 

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