Are you puzzled by the sight of your Christmas Cactus turning purple? Don’t fret just yet! While it may seem concerning, there are several reasons why holiday cacti, such as Christmas cacti and Thanksgiving cacti, undergo this color transformation. The good news is that in most cases, it can be reversed without much worry. Let’s explore the six most common culprits behind the purple hue of your beloved Christmas cactus.
Unraveling the Mystery of the Color Transformation
According to Michigan State University, the purpling of leaves in Christmas cacti is a result of pigments called anthocyanins. These pigments act as a protective shield against excessive light and even enhance stress tolerance. However, the amount of anthocyanins can be influenced by various factors.
You're reading: Why is My Christmas Cactus Changing Color? Discover the 6 Causes
1. Overexposure to Direct Sunlight
One of the primary reasons why your Christmas cactus may be turning purple is due to too much sunlight. While this isn’t necessarily harmful, it’s a signal that your plant wants you to reduce the amount of light it receives. In its natural habitat, the Christmas cactus grows as an epiphyte on trees, basking in “bright indirect light” or dappled/filtered sun. Hence, if you place it in a window that receives direct sun throughout the day, you’re likely to witness the purpling of leaves. To restore its green color, simply find a location in front of an Eastern or Western-facing window. If direct sunlight is absent, even better. However, be cautious not to reduce the light levels too much, as it may hinder blooming. This phenomenon is more common during the summer months when light is abundant.
2. Chilly Temperatures
Read more : 3 Secrets to Getting Your Christmas Cactus to Bloom and Care Tips
Cooler temperatures contribute to an increased concentration of anthocyanins and limit phosphorus uptake, both of which result in purple leaves. The Christmas cactus and Thanksgiving cactus belong to the Schlumbergera genus, native to the Brazilian jungle. Consequently, they do not appreciate cold temperatures. To ensure optimal flowering and growth, maintain minimum temperatures above 55°F. Surprisingly, a drop in temperature at night can even encourage your Christmas cactus to bloom. On the other hand, high temperatures can decrease anthocyanin concentrations. Aim for an ideal temperature range of 60-85°F when cultivating your Christmas cactus.
3. Lack of Nutrients
A deficiency in nutrients, particularly phosphorus, can lead to purple leaves. Several factors can cause phosphorus deficiencies. Regularly fertilizing your plant with a general-purpose indoor fertilizer usually supplies all the necessary nutrients, eliminating this cause. Nevertheless, be aware of your soil’s pH level, as it affects phosphorus availability. If the soil pH is too low or too high, even sufficient fertilization won’t help. Generally, a soil pH level between 6-7 works well for most plants, including the Christmas cactus.
4. Root Overcrowding
Severely root-bound Christmas cacti struggle to uptake enough water due to cramped roots. This limited water uptake can also affect phosphorus absorption, even with regular fertilization. While Christmas cacti don’t require large pots due to their smaller root systems, they eventually outgrow their current ones. Repotting your Christmas cactus into a larger pot will alleviate the issue of overcrowded roots and enhance its overall health.
5. Improper Watering
Read more : Christmas Cactus or Thanksgiving Cactus? Which One Do You Have?
In an attempt to avoid overwatering, many people inadvertently deprive their plants of proper hydration, leading to dehydration. Inadequate watering causes the root system to dry up and die. Additionally, not moistening all parts of the soil thoroughly creates dry pockets, further damaging the roots. Consequently, the plant’s ability to uptake phosphorus is compromised, resulting in purple leaves. Avoid relying on moisture meters, as they can be unreliable in determining soil moisture levels. Instead, ensure a regular watering routine to maintain proper soil moisture.
6. Excessively Wet Soil
Constantly wet soil, whether due to poor drainage or overwatering, can cause root rot in your Christmas cactus. Unfortunately, damaged roots from root rot restrict water uptake, which ironically limits phosphorus absorption and causes purple discoloration. Even with good drainage, check saucers at the bottom of the pot to avoid water accumulation. Christmas cacti, despite their jungle origins, require well-drained soil to thrive. Take care to provide your Christmas cactus with excellent drainage to maintain its root health. The choice of the right potting mix also plays a crucial role in the well-being of these tropical plants.
In conclusion, now you understand why your Christmas cactus might be changing color. Have you ever experienced your plant turning purple? Share your stories and thoughts in the comments below.
Source: https://designsofapril.com
Category: Succulent
