Perennials

Also known as herbaceous perennials, these plants are the mainstay of garden borders. They can be deciduous (die back each year), such as delphiniums; or evergreen, like many grasses. Pick wisely and you'll get year-round interest.

Oriental treasures

Despite their delicate looks, Japanese anemones are tough plants and are easy to grow.

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  • Hardiness ratings

    All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

    • H1a - Under glass all year (>15C)
    • H1b - Can be grown outside in the summer (10 - 15)
    • H1c - Can be grown outside in the summer (5 - 10)
    • H2 - Tolerant of low temperatures, but not surviving being frozen (1 to 5)
    • H3 - Hardy in coastal and relatively mild parts of the UK (-5 to 1)
    • H4 - Hardy through most of the UK (-10 to -5)
    • H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
    • H6 - Hardy in all of UK and northern Europe (-20 to -15)
    • H7 - Hardy in the severest European continental climates (< -20)
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    RHS Plants Shop

    Perennials chosen by the experts

    Perennial plants are the mainstay of the garden border and can provide interest throughout the year.

    View specially-selected Perennials at the RHS Plants Shop

    Get involved

    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.