HydrangeaL. – Hydrangeaceae

(Greek hydor = water, angeion = vessel)

Hydrangea macrophylla,

Under normal conditions all H. macrophylla varieties are more or less pink. In order to obtain the much desired light gentian blue colour for an open ground or container plants, you need acid soils, i.e. the pH-value should be around 4.5. The blue colour is mainly determined by the concentration of aluminium ions. A more intense colour can be achieved by watering with ammonia alum or aluminium sulphate (3g/1 litre of water) once a week for 4 to 5 times when the flowers are formed. However, not all red cultivars can be dyed – eg. H. macrophylla ‘Masja’.

Pruning - Flowers 

                The question of why H. macrophylla will not flower at all is raised time and again.

                There are 3 reasons:

  1. Last years shoot were damaged by frost in winter.
  2. Faulty pruning. Flower buds are mainly formed on the previous season’s shoots. Only the crowded shoots or frost-damaged tips should be cut.
  3. Too wet during the flower forming period from June to August. Plants will sprout again.

 

Colour of Hydrangea flowers depending on the pH-level (after Haworth-Booth)

 to pH 4.56                   intense blue

 pH 4.57 to pH 5.13     blue flowers

 pH 5.14 to pH 5.50     blue-pink

 pH 5.51 to pH 6.51     lilac-pink

 pH 6.52 to pH 6.89     dark pink

 pH 6.90 to pH. 7.36    pure pink

 Flowering: generally June – September or July - October

 

 Note: For other varieties as well as sizes available please contact our team.

 

Hydrangea macrophylla

      

 

 Pink, Red, White, Blue

4 x tr, container grown,         high 80-100

Hydrangea paniculata

 


 

Garden vaieties

 Specimen

Medium-sized shrub with strong,

upright dark red wood.

                         4 x tr, wire rootballed,    

                         spread 100-150, high 125-150

                            

   

 

   

 

   

 

   

 

   

 

   

 

   

 

   

 

 

 

 

Hydrangea petiolaris

 

   

petiolaris S. & Z., Japanese climbing hydrangea

Habit Climbing shrub or prostate, dense, groundcover, climbing up trees and walls with aerial roots and tweeting shoots. Initially slow growing. 
Size

On trees and walls 10 to 15 m in height, in its native habitat even higher. Free standing up to 1.5 m in height, growing into a dense shrub.

Bark

Deciduous, opposite, ovate, 6 to 10 cm long, glossy dark green above, lighter beneath, slightly leathery-greasy, distinctive long petioles, 15 cm long. Autumn colour is yellow.

Foliage

Deciduous, opposite, ovate, 6 to 10 cm long, glossy dark green above, lighter beneath, slightly leathery-greasy, distinctive long petioles, 15 cm long. Autumn colour is yellow.

Flowers

Flat, white, up to 25 cm wide corymbs surrounded by sterile ray-florets, sweetly scented, June to July.

Roots

Strong, densely branched and compact, to mid-depth, with many fibrous roots close to the surface. 

Site Sun/shade, prefers cool, moist positions (woodland plant).
Soils

Prefers open and well-drained, moist nutrient-rich, acid to neutral soil, intolerant of chalk, intolerant of compaction.

Characteristics

Very frost-tolerant, occasionally suffers damage from late frost. Tolerant of urban sites. Withstands deep shade and root competition from large trees.

Specimen

5 xtr, container grown                      high 200-225