Yellow is the most joyous colour of the spectrum. It lifts our spirits and adds a touch of clarity and vibrancy to any area in the garden, even on the dullest day. Pass from an area of green, grey or purple-leaved shrubs to a pool of golden foliage and flowers and we experience the same sudden cheering of spirit as when the sun emerges unexpectedly from behind grey clouds.
But gardeners need to take care. Just as an over-adornment of gold jewellery is tacky, so gol...
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