The Reasons and Solutions for Purple Velvet Plant Yellowing Leaves
Purple velvet, as a popular variety of the Crassula family in the succulent plant world, has dark purple leaves that are highly ornamental. However, yellowing leaves often trouble growers during maintenance. This article systematically analyzes the causes of yellowing leaves from three core dimensions: water management, light adjustment, and substrate optimization, and provides operable solutions.
Analysis of the Three Major Causes of Yellowing Leaves in Purple Velvet
Excessive Water Causes Root Rot
Purple velvet has the drought-resistant characteristics typical of succulent plants, with waxy leaves that can store a large amount of water. During the dormant period (summer above 30℃), the water requirement is only 1/3 of that during the growing period, requiring watering once a week. Diagnostic points: The base of the leaves turns yellow first, easily falls off when touched, and is accompanied by root browning. Emergency plan: Immediately remove the pot and air-dry the roots for 2 days, trim the rotting roots with a sanitized scissor, and replant with new soil containing 40% perlite.
Direct Strong Light Causes Sunburn
In spring and autumn, it is necessary to maintain scattered light of 12,000-15,000Lux. When the light intensity exceeds 50,000Lux in summer, the leaves will show sunburn spots within 48 hours. Protective measures: Use a sunshade net with 60% shading from May to September, and full sunlight can be accepted in winter. Special treatment: There is no need to remove the sunburned leaves; spraying seaweed extract can promote the germination of new leaves.
Substrate Hardening Hinders Respiration
The ideal growing substrate should meet a porosity greater than 35%. Recommended formula: 30% akadama soil + 25% volcanic rock + 20% humus soil + 15% diatomaceous earth + 10% rice husk charcoal. Add 3g/L slow-release fertilizer during potting every year to maintain soil fertility. Key indicator: The substrate is qualified if it fully penetrates within 30 seconds after watering.
Systematic Maintenance Plan
Establish a periodic maintenance log to record each watering time, duration of light exposure, and the growth rate of new leaves. Apply a 2000 times diluted liquid fertilizer for succulents once a month in spring and autumn, combined with benomyl drenching once a quarter, which can prevent more than 80% of diseases. When the ambient humidity is persistently above 70%, turn on the circulating fan to maintain air circulation.
By precisely controlling water and fertilizer supply, establishing a stepped light scheme, and optimizing the proportion of the cultivation substrate, the incidence of yellowing leaves in purple velvet can be significantly reduced. It is recommended to use a plant growth monitor to obtain real-time data such as EC value and light intensity, achieving scientific and fine management.