Because blackberries belong to the same genus as raspberries,[27] they share the same diseases including anthracnose which can cause the berry to have uneven ripening and sap flow may also be slowed.[28][29] They also share the same remedies including the Bordeaux mixture,[30] a combination of lime, water and copper(II) sulfate.[31] The rows between blackberry plants must be free of weeds, blackberry suckers and grasses which may lead to pests or diseases.[32] Fruit growers are selective when planting blackberry bushes as wild blackberries may be infected[32] and gardeners are recommended to purchase only certified disease-free plants.[33]