faginea 7 2000 Open forest of Quercus ilex 1140 8 2000 Thicket with Quercus ilex 1235 9 600 Open forest of Tilia platyphyllos 1080 with Quercus faginea 10 400 Open forest of Quercus faginea 1215 11 300 Mixed forest of Corylus avellana
1000 and Quercus faginea 12 200 Open forest of Quercus faginea 1095 13 200 Thicket with Quercus faginea 1155 14 100 Forest of Corylus avellana
, 1200 Tilia platyphyllos and Quercus faginea 15 0 Thicket with Quercus faginea 1185 16 0 Open forest of Quercus faginea 1200 17 0 Pine forest with Quercus faginea 1150 18 0 Pine forest with Quercus faginea 1100 19 0 Forest of Corylus avellana
1150 20 0 Forest of Corylus avellana
Fourth on my shopping list is Corylus avellana
'Contorta' - the Corkscrew Hazel.
'Contorta' (Corkscrew hazel) This unusual evergreen shrub grows to 6m (20ft) tall and 5m (16ft) wide, producing striking twisted stems and clusters of long yellow catkins at the end of winter.
1988), with further testing of all sera that were positive in the PHADIATOP for common allergens Dermatophagoides pteronyssinus, cat, molds (Alternaria tenuis, Penicillinum notatum, Cladosporium herbarum), mixed trees (Betula verrucosa, Corylus avellana
, Aldus incana, Quercus alba, Salix caprea), mixed grasses (Phleum pratense, Lolium perennae, Anthoxanthum odoratum, Secale cereale, Holcus lanatus), and dog.
The twisted hazel, Corylus avellana
Contorta and Salix matsudana Tortuosa are the best for borders as they respond well to pruning and can be kept shrub-size.
The corkscrew hazel, Corylus avellana
Contorta, sheds its leaves in winter but the bare twigs are its most decorative feature.
The trees that I am referring to include Betula pendula, our native silver birch, Betula utilis 'Jacquemontii', the Himalayan birch with white peeling bark, Corylus avellana
'Contorta', the corkscrew hazel with its strange twisted and distorted stems and Alnus glutinosa, the native alder.
CONTORTA: Strictly speaking, Corkscrew hazel isn't a winter plant because it's often grown for its unusual, crinkly leaves.
shrubs (including Corylus avellana
, Sambucus racemosa, Prunus spinosa, Cytisus scoparius, Crataegus monogyna, Salix caprea, and Lonicera periclymenun) and dense populations of plants such as Pteridium aquilinum and Epilobium angustifolium.
In Corylus avellana
the seed coat (testa) and the pencarp release inhibitors (probably abscisic acid) that travel via the cotyledons to suppress development of the embryonic axis (Bradbeer, 1968; Jarvis, 1975; Shannon et al.
'Contorta' is a hazel grown for its winter silhouette.
The common hazelnut, Corylus avellana
, is great value, providing cobnuts in September and decorative catkins in late winter.
I have recently seen the very first signs of new male catkins on wild Hazel, Corylus avellana
and these begin the gradual process of distributing their pollen in early February, followed soon afterwards by Yew (Taxus baccata) and Alder (Alnus glutinosa).
contorta (Corkscrew hazel) - This unusual evergreen shrub grows to 6m (20ft) tall and 5m (16ft) wide, producing striking twisted stems and clusters of long yellow catkins at the end of winter.
Unevenness of the canopy, coupled with small leaf size, favors penetration of light along trunks and the ground and accounts for the abundance of giant lianas (Clematis vitalba, Hedera helix, Vitis sylvestris before phylloxera) in the upper tree layers, the higher proportion of giant shrubs in the secondary tree layer (Cornus mas, Cornus sanguinea, Corylus avellana
, Crataegus monogyna, Evonymus europaeus, Prunus spinosa, Sambucus nigra, and Viburnum lantana), and high underlayer densities (average of 5000 stems per [ha.