Ranunculus plants typically die due to issues like overwatering, poor drainage, or inadequate sunlight. Ranunculus shows dying signs when it’s infected by Powdery Mildew.
Ranunculus plants are commonly called the Buttercups/Spearworts/water crowfoots. The plant is grown for its beautiful blossoms.
Ranunculus are Perennials that give out red, orange, pink, and yellow-colored blossoms that look like origami flowers thanks to multiple layers.
Ranunculus grows well in garden beds and pots. The plant does run into issues, in this article you’ll learn how to fix them!
Ranunculus leaves turning yellow
Ranunculus leaves turn yellow typically due to overwatering and nitrogen/Iron deficiency. Ranunculus also turns yellow when the plant doesn’t get adequate sunlight.
Dry soil also causes Ranunculus leaves to go yellow. So, you need to consider all these aspects when trying to fix your yellowing Ranunculus plant.
Why is my Ranunculus wilting?
The Ranunculus plant wilts and turns yellow when the plant gets more water than needed. Overwatering leads to waterlogged soil.
Roots can not absorb nutrients/water efficiently from waterlogged soils. This is the reason for the wilting and yellowing of the Ranunculus leaves.
If Ranunculus sits in waterlogged conditions for a long time, the roots get rotten. Crown rot and Root rot are favored by soggy soil.
Both these diseases are caused by fungal pathogens. Crown rot is seen in hot & humid climatic conditions. Lower leaves turn yellow followed by browning.
In Ranunculus affected by the crown rot, the lower part of the stem turns brown. Did it rain recently where you live?
Rain wets the soil too much and leeches away the essential nutrients. So, do not water your Ranunculus if it rained recently.
Tip: Check the soil moisture with your fingers/soil moisture meter. Water only when the plant is thirsty.
Root rot/Crown rot control in Ranunculus
- Water only when the top inch of the soil is dry. Check the soil with your fingers.
- Make sure the potting mix drains the excess water efficiently. Use a pot with holes that drain the excess water properly.
- Is your garden soil heavy? Clay soils are heavy and hold water for longer than desired. Mix Perlite according to the requirements to increase the drainage.
How to treat Crown rot/Root rot in Ranunculus?
- Prevention is only possible if you detect the disease early on. Drench the soil in Aliette/Captan (2 tbsp, in a gallon of water). Doing this once a month can treat the disease if you respond early.
- If the disease has progressed greatly, just discard the plant and sterilize the soil around it.
Ranunculus leaves turn pale/yellow due to inadequate sunlight. The plant needs bright sunlight to thrive and blossom.
Make sure your Ranunculus gets full sunlight if it’s growing in the garden. If the plant is growing indoors, ensure that the plant gets direct sunlight for at least 6 hours a day.
For indoor Ranunculus, the temperature should not rise above 60F.
Nitrogen Deficiency in Ranunculus
Ranunculus turns yellow due to Nitrogen deficiency. Soil becomes Nitrogen-deficient when it is not given a sufficient amount of fertilizer.
Nitrogen-deficient Ranunculus plants’ bottom leaves turn yellow. Newer leaf growth is often greener, which is the main sign of Nitrogen deficiency.
Miracle-gro(15-30-15) works well on Ranunculus plants. The higher Phosphorus levels are good for the blossoms.
Get the soil tested if you’re unsure about the Nitrogen deficiency. You can treat the plant according to the test results.
Note: Iron deficiency also turns the leaves yellow. I’ve not seen this happen to my Ranunculus yet but it’s a thing to look out for! Getting a soil test is worth it.
Ranunculus leaves will turn yellow once the plant is done with the blossoms. This is completely natural and you don’t need to panic.
After the plant has done flowering, give the plant some time. Do not prune the plant now as you’ll only harm the plant.
After the leaves turn yellow completely, prune off such leaves in the Fall. You can prune such leaves at the base to promote the next batch of flowering.
Doing this you’ll also let the corm rest till the next season.
Ranunculus Powdery Mildew
Powdery mildew is a common fungal disease that can affect Ranunculus. Powdery mildew signs are seen primarily on the leaves.
Powdery mildew spores grow on the wet leaves. So, leaving your leaves wet for a long time is not a good idea.
Do not wet your Ranunculus leaves when watering. Wet leaves are a good habitat for a variety of fungal spores.
A white layer forms on the infected leaves of the Ranunculus plant. This layer forms on the upper sides of the leaves.
On the lower side, one can clearly see the fungal outgrowths. Symptoms develop on the undersides of the leaves initially.
Treat Powdery mildew in Ranunculus
- Baking soda mixed with detergent and water can eliminate the spores of Powdery mildew efficiently.
- Sulfur-containing organic fungicides work to prevent and treat Powdery mildew in Ranunculus.
- Prune off the infected leaves of your Ranunculus using a pair of sterilized pruning shears. If you do this as soon as you see the early signs, you can prevent a large-scale infection.
Why are my Ranunculus not flowering?
Ranunculus doesn’t flower when the plant doesn’t get adequate sunlight. Root rot can also prevent Ranunculus from flowering.
- Insufficient Sunlight: Ranunculus plants thrive in full sun to partial shade. If they aren’t receiving at least 6-8 hours of sunlight per day, they may not produce flowers. Ensure they are in a location with adequate sunlight exposure.
- Overcrowding: Ranunculus bulbs should be spaced apart when planting. If they are planted too closely together, they may compete for nutrients and space, resulting in reduced flowering. Ensure there is enough space between the bulbs.
- Planting Depth: Ranunculus bulbs should be planted at the right depth. If they are planted too deep, they may struggle to reach the surface to bloom. Typically, these bulbs should be planted about 2 inches deep with the “claws” facing downward.
- Soil Quality: Ensure that the soil is well-draining and rich in organic matter. Ranunculus prefer soil that is slightly acidic to neutral. Poor soil quality can inhibit flowering.
- Proper Watering: Overwatering or underwatering can also affect flower production. Ranunculus prefer consistent moisture but not waterlogged conditions. Water deeply when the top inch of soil is dry.
- Nutrient Balance: Ranunculus benefit from a balanced fertilizer with a higher Phosphorus content (the middle number in the N-P-K ratio) to promote flowering. Apply fertilizer as directed on the product label.
Ranunculus leaves curling
Ranunculus leaves curl up due to aphid infestation. Aphids curl the leaves inward and hide inside the distorted/curled leaves. Aphids suck on the plant sap, making the plant weak.
Aphids excrete a sticky material called Honeydew which attracts a variety of fungi. These fungi grow on the plant to form the black, ugly ‘sooty mold’.
How to get rid of Aphids on Ranunculus?
- You can dislodge aphids on the affected Ranunculus by spraying a forceful stream of water on the affected stem.
- Hang sticky, yellow cards around your Ranunculus plant to identify an infestation early on.
- Spray Neem oil on the affected branches of Ranunculus to get rid of these pesky pests naturally.
- You may want to spray Insecticidal soap on the affected branches to eliminate these pesky pests.
Happy Growing 🙂