Garden warning as dangerous black spot disease invades popular flowers

12 September 2023 , 11:09

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Black spots are most likely to hit gardens in autumn (Image: Getty Images/iStockphoto)

A gardening expert has warned homeowners to stay vigilant over “one of the most serious fungal diseases for roses", which could stop the flower from blooming next year.

Michael Griffiths has shared his top tips for eradicating black spots on the treasured plants as cooler temperatures and wetter weather increases the likelihood of the dangerous disease.

Beyond being visually unappealing, black spot can weaken roses, cause them to shed, and make the flowers more susceptible to other diseases.

The best defense is said to be proactive prevention, such as keeping weeds and pests at bay in garden beds. In a recent online video, the expert urged people to look out for their roses turning yellow and rapidly falling off the plant.

To combat the issue, he advised: "The best thing you can do is pick them off, and remove any and all affected leaves, even if that means completely defoliating the plant. If you're doing this with a pair of secateurs, remember to give them a good clean after to stop the spread. Or, you can pull in the opposite direction to the growth to easily remove them by hand."

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Michael said there are preventive methods for black spots (Getty Images/iStockphoto)

Michael stressed that any leaves that have black spots or are suspected to have black spots should be destroyed immediately, reports Express. He urged people not to leave it on the ground or put it in a compost bin. Despite it being a serious issue, Michael said it can easily be prevented with proper care. He suggested that pruning, watering, and mulching will help reduce the chances of black spots reoccurring.

Pruning, which involves removing dead or overgrown parts of a plant, not only keeps the plant healthy but also encourages fresh growth on flowers. This crucial step can be undertaken in late summer. He added: “Pruning at the right time in an open bowl shape to an outward-facing bud will reduce the chance of mould, mildew and black spots taking hold. Water deeply so the plant doesn't get stressed and mulch to around three inches, which will lock in moisture and suppress weeds.”

September is the ideal time to start mulching your gardens. The gardening technique involves spreading a layer of nutritious material over soil and around plants. It is a natural weed deterrent and can also serve as a protective barrier against harsh weather conditions.

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Katherine McPhillips