BBC Gardeners' World

Problem solving

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  Magnesium deficiency

  Yellow leaves on plants, particularly fruit & veg.

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  Moles

  Piles of soil on lawns, and underground tunnels in soil.

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  New Zealand flatworms

  Large worms that eat our native earthworms.

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  Pollen beetles

  Small bronze-green shiny beetles on flowers.

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  Powdery mildew

  A white powder coating covers the leaves of shrubs.

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  Reversion

  Variegated plants start growing all-green leaves.

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  Rose blackspot

  Dark spots on rose leaves, which later drop off.

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  Rose bloom balling

  Rosebuds develop but fail to open, and finally drop off.