Mexican Fence Post Cactus Turning Yellow

I think it s an exceptionally attractive cactus and i wish i had acquired a few more.

Mexican fence post cactus turning yellow. Cactus showing signs of scale insect infection source. If frost is in the forecast cover the top of the cactus with an old t shirt foam cup or wash cloth. Rot proper watering is essential to the. An under watered cactus may also pucker or shrivel but can also discolor usually getting brown and dry or calloused.

One in the cluster is turning yellow w black soft circles from the bottom to the middle. It branches from the bottom. What is happening to my mexican fence post cactus pachycereus marginatus. The rest of the barrel cactus ooks fine.

Maintenance plant the mexican fencepost in well draining soil and full sun with reflected heat or partial shade. The mexican fence post is native to the states of hidalgo queretaro and guanajuato and is widely planted and naturalized throughout mexico. The yellowing of this mexican fence post cactus might be mitigated with a reduction in watering. Marginatus does not grow arms.

If your succulents and cacti are showing these symptoms give them a nice thorough watering. Water sparingly in the winter as it does not grow in cold weather. I planted this specimen on the east side of my garden as it prefers partial shade. I have a cluster of 3 mexican fencepost cactus that were planted in 9 09.

If the soil is not dry move the pot to an area where the cactus can get more sun. I noticed this brown spots on my cactus and i was not sure if it is some form of. Wikipedia commons cold temperatures mexican fencepost is frost sensitive. I recently bought these 2 cacti and placed them in the same pot.

The mexican post is turning yellow on one side and the barrel cactus has lines on one area. Always use well draining cactus or succulent soil though because your plants won t want to hang out in wet soil for long. If the cactus is turning yellow or brown it is getting too much sunlight and you should move it into a spot with better shade. Asked october 12 2016 10 28 am edt.

The mexican fence post will eventually reach 20 feet tall and will remain as straight as it is in this photo.