It’s rose season, where traditional beautiful scented blooms come into their own, filling the air with fragrance and adding a riot of colour to borders. But you don’t have to reach for the pesticide spray if you see colonies of aphids on your roses or despair of the blackspot, because there are organic ways to grow healthy roses, says award-winning garden writer, lecturer, and organic gardener Val Bourne, who is giving talks at this year’s Hever in Bloom  at Hever Castle & Gardens, where more than 5,000 roses are in flower over the summer. “Organic gardening is about food webs in your garden and this is where so many people go wrong,” she says. “They see aphids on their roses and they’ve been primed for commercial reasons to think they have to spray those aphids, but actually those aphids are going to feed ladybirds, hoverfly larvae; wrens and blue tits are going to take them. “All these little things in the garden are the foundation layer that supports the upper layer.” Neil Miller, head gardener …