Purple or red discoloration on Alchemilla leaves can be alarming, especially when it seems to appear out of nowhere. This change in color is often a sign that something isn’t quite right, but it doesn’t necessarily mean your plant is beyond saving. I’ve encountered this issue in my own garden, and while it was initially concerning, I was able to figure out what was going on and bring my Alchemilla back to health. Let me share what I’ve learned so you can do the same.
Why Are My Alchemilla Leaves Turning Purple or Red?
When Alchemilla leaves change color, it’s usually a sign of stress. The most common reasons for this discoloration are related to environmental factors or nutrient imbalances. While the leaves are typically a vibrant green, anything from cold temperatures to a lack of essential nutrients can cause this shift.
Cold Weather Shock
One of the most frequent causes I’ve seen for purple or red discoloration is cold weather. Alchemilla is relatively hardy, but sudden drops in temperature or extended exposure to cold can cause the leaves to turn red or purple. It’s their way of coping with the stress, and while this might look unsettling, it’s not always fatal. I usually keep an eye on the forecast, and if frost is expected, covering the plants with a light cloth has helped mitigate the damage.
Nutrient Deficiency
A lack of phosphorus is another culprit. Phosphorus is essential for energy transfer and root development in plants. When the soil doesn’t have enough of it, you’ll often notice purpling on the leaves. This was the issue I faced a couple of seasons ago. I had to adjust the soil’s pH and add a phosphorus-rich fertilizer to help the plants recover. Within weeks, the new growth was back to its healthy green.
How to Fix Purple or Red Discoloration
Once you’ve identified the cause, there are steps you can take to remedy the situation. Don’t panic, though—Alchemilla is a resilient plant, and with the right care, it can bounce back.
Addressing Cold-Related Discoloration
If cold weather is the issue, consider moving the plants to a more sheltered location or using a frost cloth during cooler nights. If they’re already established and moving them isn’t an option, just try to protect them during extreme weather swings. In my case, keeping a close eye on the weather helped prevent future incidents.
Correcting Phosphorus Deficiency
If you suspect a phosphorus deficiency, start by testing your soil. If the pH is too high (above 7), phosphorus becomes less available to the plant. Adjusting the pH by adding soil amendments, like organic matter or a fertilizer specifically designed to address phosphorus levels, can be effective. I’ve also found that using bone meal or rock phosphate provides a slow-release source of phosphorus, which is great for long-term plant health.
Preventing Purple or Red Discoloration in the Future
To keep your Alchemilla thriving, it’s important to provide consistent care and monitor conditions closely.
Soil and Fertilization Tips
Healthy, well-draining soil with a balanced pH is key. I make sure to feed my plants with a balanced fertilizer a couple of times a year, especially during the growing season. This helps keep the nutrient levels steady and reduces the chances of deficiencies cropping up.
Protecting Against Weather Changes
If you live in an area with unpredictable weather (like I do), it’s a good idea to keep frost covers or other protective measures handy. I’ve learned that being prepared for sudden cold spells can make a big difference in how my plants fare through the season.
Conclusion
Purple or red discoloration on Alchemilla leaves is a sign that your plant needs attention, but with some simple adjustments, you can often resolve the issue quickly. Whether it’s adjusting the soil nutrients or protecting against cold, the key is to act promptly and monitor the plants closely. Over time, I’ve found that these steps not only bring the plant back to health but also strengthen it against future challenges.
