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Remove blanket weed from ponds by twisting it around a cane, or use a net or rake.
Read our advice on blanket weed
Apply shading to greenhouses and be sure to ventilate on warm days.
Read our advice greenhouse shading and ventilation
Erysimum 'Bowles's Mauve' is a plant that every garden should have. See it in full bloom at RHS Garden Harlow Carr this month.
More on this plant
Well-respected plantsman, Graham Rice, uncovers all the latest new plants in his blog.
Read Graham's blog
Look out for bacterial canker on on trees, especially plums and cherries.
Watch out for aphid infestations - it is easier to control those caught early.
© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262