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We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records.
Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience.
When using this search
Search by plant name, key attributes or both to find plant details and a list of
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
Other common names
Quercus robur 'Kosteri Fastigiata' Quercus robur 'Fastigiata Koster'
Quercus robur f. fastigiata 'Koster'
Quercus can be deciduous or evergreen trees or shrubs, with entire, lobed or toothed leaves; flowers inconspicuous, followed by characteristic acorns; sometimes good autumn colour
'Koster' is a fastigiate form with upright branches, spreading with age to ultimately reach approximately 20m high and 3m wide. Usually seed-raised so can be variable. Leaves are dark green with shallow lobes
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect West-facing or East-facing or South-facing or North-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained, Well-drained
SoilClay, Loam, Sand
pHAcid, Alkaline, Neutral
Higher than 12 metres
Time to ultimate height
more than 50 years
Grows well in most deep, fertile soils and is lime tolerant
Propagate by seed, sown as soon as ripe, in a cold frame
Suggested planting locations and garden types
Cottage & Informal Garden
Pruning Pruning group 1
Pests Susceptible to aphids, caterpillars, leaf-mining moths and oak gall wasps
May be affected by powdery mildews. Also oak wilt in USA only
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.