Aloe vera is a popular houseplant, valued for its ornamental appeal and widely recognized for its gel, which is used in many cosmetic and medicinal applications. Sometimes, owners notice a purple discoloration inside the leaves of their aloe vera plants. This article explores the reasons behind this color change, whether the gel remains safe to use, and how to care for a discolored plant.
Why Aloe Vera Turns Purple
The primary reason an aloe vera plant develops a purple hue is the production of anthocyanins, pigments that cause purple coloration. These pigments are a plant’s natural response to stress, acting as a protective mechanism. Various environmental factors can trigger this production.
Excessive sunlight is a common cause of purple discoloration. When an aloe vera receives too much direct sun, it produces anthocyanins to shield itself, resulting in a “tanning” effect. Temperature extremes also contribute to this stress. Both very cold and very hot conditions disrupt the plant’s functions, leading to purple leaves.
Watering practices significantly impact an aloe vera’s health and color. Both underwatering (dehydration stress) and overwatering (leading to root rot and nutrient uptake issues) can trigger anthocyanin production. Root rot starves the plant of essential nutrients and oxygen.
Nutrient deficiencies, particularly in magnesium and phosphorus, also contribute to purple discoloration. Magnesium is important for chlorophyll production, and its deficiency allows purple hues to dominate. Phosphorus plays a role in energy transfer and root development, and a lack of it can also result in purpling.
Is Purple Aloe Vera Safe to Use
The purple color in an aloe vera leaf indicates plant stress, but it does not make the gel unsafe for topical use. While the gel itself is considered safe, the stress might reduce the potency or quality of its beneficial compounds.
Assess the gel for other signs of deterioration before use. If the gel has a mushy texture, an unpleasant odor, or shows signs of mold growth, do not use it. Fresh aloe vera gel is clear or slightly yellow. A change to brown or a noticeable shift in smell suggests degradation. For internal use, consulting a healthcare professional is always advisable.
Caring for Purple Aloe Vera
Addressing underlying stressors helps an aloe vera plant recover from purple discoloration. Adjusting the plant’s light exposure is often the first step. Aloe vera thrives in bright, indirect sunlight. If the plant has been in direct sun, gradually move it to a spot with filtered light. Introduce the plant to brighter conditions slowly to prevent sunburn.
Proper watering techniques are important for aloe vera’s health. Allow the soil to dry out completely between waterings, checking the dryness by inserting a finger into the top two inches of soil. Deep watering should be done infrequently, ensuring the pot has drainage holes to prevent soggy soil and root rot. Maintain temperatures within 55°F (13°C) to 80°F (27°C) to prevent stress.
The right soil and potting conditions are also important. Use a well-draining potting mix for succulents or cacti. A pot with drainage holes is important to prevent water accumulation. Repotting may be beneficial if the plant is root-bound or the soil quality has degraded.
Fertilization should be done sparingly, once a month during spring and summer growing seasons, using a balanced houseplant formula diluted to half strength. Over-fertilization can harm the plant. Patience is necessary during recovery, as it takes time for the plant to regain its vibrant green color.