Hi Maxime. Butterfly bushes are relatively troublefree. If you have a lot of leaf wetness, they can get Downy mildew which is caused a fungus. Avoid any water splashing on leaves. Plants need to be watered at the soil level. If you keep water from splashing on the leaves, it should end up fine. Pesticide use on these shrubs is discouraged, particularly when in bloom, because of the wide variety of beneficial insects the plant attracts to keep it healthy.
Hi Maxime. Butterfly bushes are relatively troublefree. If you have a lot of leaf wetness, they can get Downy mildew which is caused a fungus. Avoid any water splashing on leaves. Plants need to be watered at the soil level. If you keep water from splashing on the leaves, it should end up fine. Pesticide use on these shrubs is discouraged, particularly when in bloom, because of the wide variety of beneficial insects the plant attracts to keep it healthy.