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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.
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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.
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Other common names
hogweed cow parsnip
cadweed clogweed eltrot giant parsnip madnep meadow parsnip
Heraclium can be biennial or perennial herbs and include species such as Giant Hogweed, Fennel, Cow Parsley and Ground Elder.
The hogweed is more diminutive than its infamous cousin, giant hogweed and doesn't carry the same health warnings. Although it may reach 2m in height, it's generally much shorter at 1m. Stems are ridged and hollow, leaves hairy with broad, pinnate lobes. Off-white umbels are borne from midsummer to early autumn. It may be a biennial or monocarpic perennial.
Toxicity Sap may be an irritant. Wear gloves and other protective equipment when handling
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
MoistureMoist but well-drained
Time to ultimate height
Naturally grows in grassy places of rough grazing, hedgerows and roadsides.
Propagate by seed
Suggested planting locations and garden types
Wildlife Gardens Wildflower meadow
Pruning None required
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.