The top leaves are fairly new. The purple could be a magnesium deficiency which could be caused by poor pH, cold temps or genetics, or a phosphorus deficiency. The nymphs are translucent and can appear to be the same color as the leaves. One common cause of sick calatheas is an overabundance of minerals in the water source. 4. × View full size in a new window × View full size in a new window. Both nymphs and adults suck the fluids from new growth, which causes fresh leaves to be stunted or twisted. Calathea leaves curl up as a sign of distress, but the problem might not be immediately easy to identify. Sometimes the stems of the plant turn bright red or purple, but not always. I read that it could be related to a phosphorus deficiency, ph lockout leading to the deficiency and or maybe the roots were getting too cold as I had a pretty large fan blowing on them. Lilac leaves are turning purple/red and curling inward. The plant will become susceptible to disease and toxicity. Begonia stem and root rot is a fungal disease which may affect your plant. Curly top virus symptoms vary by host plant; affected tomatoes show symptoms including curling leaves, veins turning purple on the underside of leaves and a light green discoloration. In addition to appearing to look like iron deficiency, the tips of the leaves curl and the edges burn and die. You can fix your curling calathea leaves just like this wonderful example. The Type Or Quality Of Water You Use May Cause Leaf Curling. (And How to Fix It) Diseases Can Cause Begonia Leaves Curling. Picture included. True. Problem: A cannabis phosphorus deficiency generally appears on leaves from the lower/older parts of the plant. What is wrong? Hey guys, So I recently started to notice my seedlings leaves turning purple on the edges. So your 5 weeks from harvest and your leaves are beginning to turn purple. 1 Response. Stem and branches may become weak and easily broken, the plant may also stretch. Christmas cactus are relatively trouble-free succulent plants, but if your Christmas cactus leaves are red or purple instead of green, or if you notice Christmas cactus leaves turning purple on edges, your plant is telling you that something isn’t quite right. Primarily, the fan leaves surrounding the highest cola is where it is most prominent. You May Also Enjoy: Why Are My Mint Leaves Turning Purple? This disease is spread through moisture and can be activated by damp ground and cool weather. WHITEFLIES. (dead tissue). On the off chance that the temperature dropped to 50 degrees (F.) your plant will increase the up take-up of phosphorus and that will make plants turn purple .Cannabis plants tend to love phosphorus in the blooming/growing stage in the event that you … So, I am on about week 6 or so into the flowering stage for this little mamma (Blue Dream , Indica) and just recently I started noticing a strange purple growth on the fan leaves. (image source) 5. Then again it could still be root rot or a watering problem, because that will show drooping leaves and cause nutrient-like disorders to appear. This is by and large brought on by a sudden phosphorus deficiency. First apparent on the tips and margins of the leaves. Any time you see the curling of the leafs with blotchy spots on them it is most likely pesticide exposure. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. Grand County Colorado. The leaves may thicken and curl, and the affected leaves feel stiff. Asked July 1, 2016, 10:54 AM EDT. There is some blue/purple "blotches" on the outside edges of old leaves (spreading outward), some tips of leaves and now some newer ones. The lower leaves may turn dark green or yellow, and start getting spots or big splotches that look brown, bronze or even a little blue. CAUSE: Whiteflies are small, moth-like insects that cluster on the undersides of leaves. 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