Roses will stay healthy and disease-free if sprayed with an everyday household item in spring (Image: Getty)
Gardeners are beginning to enjoy the fruits of their labour as their roses swell and start to bloom, yet they should be mindful that spring can be a particularly challenging period for these beloved flowers. Roses are especially susceptible to a fungal disease known as black spot at this time of year, as the spores tend to flourish when the soil warms up but remains wet from spring conditions.
This disease takes its name from the most recognisable symptom: large, blotchy, dark marks on rose leaves that eventually drop off, spreading the infection throughout the garden. A black spot alone is unlikely to kill roses outright, but it weakens the foliage so the plant cannot absorb sufficient energy, leaving it far more vulnerable to pests and other diseases. It will cause roses to fail to flower properly, leaving you with a bare and lifeless-looking plant that is also more prone to dying back in summer as it struggles to cope with the warmer weather.
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How do you help keep roses healthy in spring?
Fortunately, Joe, a gardener and founder of In the Wild Garden, has revealed there is a natural yet highly effective method to prevent black spot on roses, or even help treat it, by spraying them with milk.
Joe said: “Mix up a solution of one part milk (full-fat milk) to two parts water in a spray bottle. Spray the remaining leaves of the plant with this solution, and repeat every week.”
It may sound peculiar, but when milk is exposed to sunlight, it produces compounds that are toxic to fungal spores, preventing them from spreading.
Milk will also create a thin coating on a leaf, making it considerably harder for spores to attach to the plant and acting as a barrier against infection.
Using milk will help prevent black spot in spring or slow down the disease if caught early enough, giving the plant a far better chance of survival.
Black spot disease is more common in spring when the soil is wet and warm (Image: Getty)How to use milk to stop black spot disease
The simplest and most effective way to keep black spot out of your garden is to keep it tidy. Black spot spores spread through decaying foliage, so ensure you are regularly picking up leaves or any other debris around the base of your roses.
Mulching your roses will also greatly help prevent black spot, as spores tend to splash onto the plant during rainfall. Covering the soil with compost or wood bark will help halt the infection in its tracks.
Next, spray the milk solution on roses once a week. Simply mix one part milk with two parts water in an empty spray bottle. Use it to mist the leaves, aiming to lightly coat the plant rather than soaking it.
Make sure you inspect your plant at least once a week for signs of black spot. Should you notice it, strip the plant of all its leaves, dispose of them in a bin, and continue applying the milk solution.
It’s worth bearing in mind that milk can produce an unpleasant odour, and it is advisable to avoid spraying it during the afternoon when the sun is at its peak, as this will leave a pungent sour smell throughout your garden.
A better approach is to apply the spray in the morning, allowing the leaves to dry more rapidly; you may also choose to apply it later in the evening if preferred.
Joe added: “One word of warning would be to do this in the evening, as the smell of milk in the garden on a hot day is not great!”
Nevertheless, ensure your roses are thoroughly dry afterwards if you apply the solution in the evening, as leaving the plant damp overnight could attract slugs or other unwanted pests.
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