In the fall, collect up all fallen rose leaves and mulch around the plant to bury the spores. Instead, always put any plant material infected by rose diseases in the trash or burn it, then clean your pruning shears to prevent the disease being transmitted to other roses when you deadhead or prune them. Never compost diseased leaves as the spores will thrive in your compost heap and be spread around the yard. If black spot does appear despite treatments, cut off the affected leaves with sharp garden snips or remove them by hand to make way for healthy new growth.Īlso examine the soil around the plant and collect up any fallen leaves showing signs of black spot. Others come as ready-to-use sprays and will tackle pests at the same time, including this BioAdvanced 3-In-1 Insect, Disease and Mite Control one, also on Amazon. Some are concentrate and need letting down, such as BioAdvanced Disease Control for roses, plants and shrubs on Amazon.

You may need to do this throughout the growing season to keep your plant healthy. To try and prevent it, mulch around your plant in spring and start spraying with a plant fungicide as soon as the new leaves start to emerge. If a rose has had black spot one year it increases the chance of it returning the next.

(Image credit: Future/Ruth Hayes) How to treat rose black spot The right types of mulch will feed the soil and roots, but also bury any black spot spores so they are less likely to be splashed back up in rain to re-infect a treated plant. Something like this Black Kow composted cow manure fertilizer from Amazon would be suitable.

It can be wood chip mulch, like this Mighty 109 cedar wood chip mulch from Amazon, well-rotted homemade compost or farmyard manure from your local farm, stables, garden store or online. Mulching generously in spring and fall is also important. Plants that grow healthily are less likely to succumb to rose pests and disease, and if they do develop problems they are better equipped to recover afterwards. Prevent this by making sure plants in your rose garden have room to grow properly, so air can move between them.Īs well as knowing when to fertilize roses, make sure you give them the right amount of rose fertilizer, like this Great Big Roses soil and fertilizer booster from Amazon, and water them correctly. Fungal diseases such as black spot and powdery mildew thrive in areas where plants are crammed in together and there is poor airflow, leading to still, warm, damp conditions.

Kiss from a rose black jack