Helen Yemm: how to make lazy geraniums sit up, a tip for lily of the valley, follow your nose for good manure

LILY OF THE VALLEY

When is the best time to split lily of the valley? I have some in a large tub outside my back door so I can enjoy the perfume, but they are now very overcrowded. Should I do it now while they are still in leaf, or wait until they die down?

C. Mordecai – via email

Lily of the valley (Convallaria majalis) belongs to the same plant family as asparagus and has a similar, spreading rhizomatous root system, sending up dark little pointed fast-growing …

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