Annuals and biennials

Easy to grow and fast to flower, annuals and biennials bring quick colour to the garden. They are usually cheap to buy in great numbers, but make a big impact in the garden. Have a go at growing them from seed

Looking forward

Late summer and early autumn is a great time to sow hardy annuals; they'll give you a wonderful display of flowers in late spring and early summer.

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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

    Annuals & Biennials

    Easy to grow and fast to flower, annuals & biennials bring quick colour to the garden, and they include many of our favourite wildflowers. Have a go at growing them from seed.

    View specially-selected annuals & biennials 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.