I have seen the beauty of a rose garden often tainted with the leaves of this flower turning yellow. Several gardeners struggle with this issue, and it is a bit of a mystery as to what’s causing it. Often this boils down to needing to learn how to tend your roses.
How to Tend Roses to Prevent Discoloration
Before planting a rose, you must know what type of rose you want as there is an overwhelming variety of this flower. So, it all comes down to what you might like; the style, size, scent, and color you would prefer.
Roses can fit into any garden or site it is placed in, but you must consider elements such as how shady the position of the planted rose might be, whether the area is frost-prone or if the soil may dry out during a season of the year.
Depending on the type of rose, you can plant them at different times of the year, but ensure they are planted in a sunny and less windy spot. Space them out when planting in your garden, except if you’re already planting in a pot with limited space.
Stake your roses as they are planted or begin to grow, and prune them accordingly. Roses, being deep-rooted plants, can survive on the moisture resident in the soil as they grow; however, you should appropriately water them during the dry periods of the year. To prevent fungal diseases and excessive watering, direct the watering towards the rose’s roots, not the flower or foliage.
Feed your rose plants with well-rotten manure and mulching. Ensure you weed your garden, periodically removing dead, diseased, or damaged shoots and fading flower leaves as it grows. You can also open the center of the rose plant to encourage air circulation, preventing fungal diseases.
Causes of Rose Leave Turning Yellow
One of the most common causes of rose leaves turning yellow is overwatering. If you’re watering your roses too often, the roots will become waterlogged, and the leaves will turn yellow. A lack of nitrogen can also cause this problem, as can pests and diseases.
Physiological Disorders/Environmental Stressors
Chlorosis, when the leaves don’t have enough chlorophyll, is a cause of rose leaves turning yellow. Chlorophyll is what gives leaves their green color, and it’s also what helps the plant make food through photosynthesis.
Chlorophyll lack can be caused by things which include:
- Soil with high alkalinity or acidity
- Nutrient deficiencies, like iron or magnesium
- Too much or too little water
- Pests or diseases
If you’re unsure what’s causing the chlorosis, take a sample of the affected leaves to your local gardening center or Cooperative Extension office, and they can help you find out what the issue is and how to treat it.
Fungal diseases are caused by fungi that attack the plant leaves, causing them to turn yellow and eventually die.
Insects often spread bacterial diseases, so checking your roses regularly for pests is important. Bacterial diseases can cause yellowing and browning of the leaves, blisters, and cankers on the stems.
Insects spread viral diseases such as aphids or splashing water from infected plants. Symptoms include yellowing of leaves, stunted growth, deformed flowers, and leaf drop.
Treatment of Rose Leaves Turning Yellow
Here are different methods of treatment to apply to fix your Rose leaves turning yellow:
You can treat some viral diseases with insecticides, but most are incurable and will eventually kill the plant. In this case, you will have to remove the plant completely to prevent it from affecting another.
If you notice any of these symptoms mentioned, you should remove the affected leaves and destroy them. You can also try spraying the plant with a bactericide, but it’s important to read the label carefully and follow the directions.
Some fungicides can treat this problem, but the most effective ones contain copper. You can also use a fungicide that contains sulfur but is not as effective as copper.
To prevent fungal diseases from occurring in the first place, make sure to keep your garden clean and free of debris. Also, water your plants early in the day, so the leaves have time to dry before nightfall.
Excessively Acidity and Alkalinity in Soil
Add organic matter, in the form of compost, to the soil to lower the pH of the soil over time, as you do it often. While compost helps lower the soil’s pH, it will also increase the microbial life and improve the soil structure causing leaf yellowing to disappear.
Apply a well-balanced fertilizer containing not only the major nutrients such as phosphorus, nitrogen, and potassium but also magnesium and iron around the soil area to improve the nutrient supply to your rose plant.
Too much or too little water
Stop watering when your rose is resting in a puddle instead of soil. Allow it to dry out to about two inches of soil, then deep water systematically, once every two days considering the weather and season.
How to Prevent Rose Leaves From Turning Yellow
First, identify what is causing the leaves to turn yellow. If it is a lack of nutrients, you can fertilize the plant. You can try shading the plant or moving it to a different location if it is too much sun. You can try treating it with a fungicide if it is a fungal disease.
You need to cut back on the watering if it’s overwatering. If it’s pests or diseases, then you need to treat them with an appropriate pesticide or fungicide. You can also try pruning off affected leaves and stems.
If you fertilize the plant, be sure to follow the instructions on the fertilizer product. If you shade the plant, be sure to provide enough light so that the plant does not become stunted.
With a little time and careful work, you should be able to get to the root of the problem and fix it.