Q: I have a star jasmine in a big pot on my patio, and I'm training it to climb the wall. It's been blooming beautifully, but lately, I've noticed some leaves turning red. What might be causing this?
A: It's understandable to be concerned about the color change in your star jasmine. Often, this signals some stress for these aromatic climbing plants.
According to Nastya Vasylchyshyna, a botany expert, the red pigmentation can be triggered by a range of environmental factors. Here, experts explain common causes, from improper watering to nutrient deficiencies, and how to prevent these issues.
Star jasmines are evergreen climbers with delightful flowers
4 Reasons Your Star Jasmine Leaves Are Turning Red
Use these insights to maintain the health of your evergreen climbing plants.
1. Temperature Fluctuations
Red foliage may indicate colder weather conditions
Brock Ingham from Bigger Garden points out that star jasmine dislikes sudden temperature shifts. 'If exposed to outdoor cold snaps, the leaves may turn red as the plant reacts to the chill,' he explains.
For indoor plants, ensure to shield it from central heating and drafts. 'Keeping the surrounding temperature stable is crucial,' he adds.
Pro tip: Nastya suggests that if your winters are too harsh for outdoor growth, you can gently dig it up, pot it, and bring it inside until the weather warms.
Nastya is a botany expert for the Plantum app, specializing in plant health and care recommendations.
Brock is a dedicated gardener studying horticulture, with extensive experience in growing unique plants and advocating for agriculture.
2. Sun Exposure Issues
Excessive sunlight can damage star jasmine leaves
Brock explains, 'In a garden setting, too much direct sunlight can scorch the foliage, leading to reddening, especially in younger plants.' Nastya recommends planting in a location that receives morning or evening sun but shade during the hottest part of the day.
If your star jasmine is in a too-bright spot, Nastya advises using a temporary canopy to diffuse direct sunlight during peak heat. 'Set it up only during extremely sunny conditions,' she says.
Brock adds: 'For indoor plants, insufficient light can also cause issues, but too much direct sunlight through a window can be just as harmful. A bright area with filtered light is ideal.'
3. Watering Inconsistencies
Red leaves often indicate plant stress
Gardening authority Lisa Eldred Steinkopf states, 'Inconsistent watering can stress the plant, leading to red leaves.' She emphasizes the need for even moisture. 'Avoid letting them sit in water, but don't let them dry out completely.'
Brock stresses the importance of good drainage to prevent root rot, which can cause stress and red leaves.
Lisa, a member of the National Garden Bureau, shares her houseplant knowledge through her blog and various publications.
4. Nutrient Deficiencies
Your plant might benefit from added fertilizer
Brock mentions that nutrient deficiencies, particularly phosphorus, can manifest as red leaves. He advises fertilizing during the growing season in spring and mid-summer. 'Just remember, less can be more,' he cautions.
Lisa adds, 'I fertilize every fourth watering, or use a quarter-strength solution every time to avoid forgetfulness.'
What to Do About Red Leaves on Your Star Jasmine?
Steps for Addressing Red Leaves
Victoria Cummins, a gardening expert, suggests assessing your care routine and fixing any identified issues. Prune any dead or overly reddened stems to redirect energy to healthy growth. If you need new pruners, check out this gonicc pair from Amazon, which is highly rated.
'With the right care, star jasmine can bounce back after addressing its stress,' she adds.
Victoria specializes in permaculture and works towards enhancing soil quality and sustainable environments.
Are Red Leaves Always a Concern for Star Jasmine?
Not necessarily—older leaves may turn red before dropping, which is a normal aging process.
Young leaves may also appear reddish-pink in spring before maturing. Such seasonal changes are typical.
Additionally, some varieties, like 'Winter Ruby,' may change color during winter and revert to green in spring.
Star jasmine's fragrance makes it an excellent choice for patios or entrances. Regular pruning is also essential to maintain its appearance. Check out our practical guide for tips.
