If you were to grow a barrel cactus from a seed about how big would it bee in 7-10 weeks? Thank you very much!
They may or may not be germinated ,yet, by that point.If they have, they won't be very big at all. Size is often difficult to describe at that age, as some plants grow a little faster than others at this stage of life. Here is an article that will give you more information on the cactus: https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/barrel-cactus-care.htm
the bottom 25% of the plant turns black and the spines at the bottom turn black also.
This is fungal infection. Usually, overwatering will lead to this, and after that will be the wrong type of soil. Black rots are usually fatal to cacti, but you can make an attempt at controlling this by mixing 1/4 3% peroxide to 3/4 water when you water it next. This can help kill off the infection to give the cactus a chance, but if it has progressed too far, then there will be no hope.
This article will help you with caring for these in the future: https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/barrel-cactus-care.htm
I want to make sure I’m caring for them right.
You have, both, a cactus and some succulents! Most succulents will have a similar care, and most cacti will have a similar care.
These articles will help:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/care-for-potted-succulent-plants.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/barrel-cactus-care.htm
I live 40 miles south of Albuquerque, NM. I just transplanted three foot tall barrel cacti outside. How much cold can they tolerate?
Barrel cactus is generally hardy to USDA zone 9, with a minimum temperature range of 25 to 30 degrees F (-4 to -1 C). Some varieties can withstand a little cooler weather.
I have a barrel cactus (live in AZ) that has two large offspring that we would like to take off and replant. How do I separate the baby from the main? Do i need to leave the baby before planting for the separation wound to dry? Do I need to buy special soil to replant these please?
These articles will help:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/barrel-cactus-care.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/removing-cactus-pups.htm
No additional details. I do not have pictures to upload.
We have two articles that will help out, here! Read these for more information:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/removing-cactus-pups.htm
My golden barrel cactus has pups growing on the top of it, some are quite large. After winter I noticed one of the pups was very soft around it's crown and rotting. I decided(reluctantly) to remove the pup, due to the closeness of the pups growing I removed 2 and moved the cactus under cover in case of rain. Removing the pups caused a wound on the main plant and before I knew it, a hole had formed and quite a large area is soft. Garden slaters have also gotten in there and I am unsure how much damage they have done. But there does appear to be a large area eaten away inside. The rest of the cactus has firm flesh and the other pups still attached are healthy also. Should I cut away all of the soft mushy affected flesh and expose the eaten away flesh inside, which would hopefully prevent the slaters? I realise I would have to protect the plant from rain. I am worried the insect damage will continue causing further damage if I don't do something, but don't want to lose my beautiful cactus completely. Any advice would be greatly appreciated.
Yes, I would cut out all the dead and dying parts. You also may want to replace the soil with fresh, sterile soil if you think the roots are affected.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/barrel-cactus-care.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm