I tend to kill plants, unintentionally, and so in April I bought a kill proof plant - a pincushion cactus. Today, I've just noticed the cactus is dying. A brown withering of the nodules is spreading from the base of the plant up. I keep the plant on my windowsill to get light and I don't water it very often. The weather here has been very unpredictable - hot and sunny one day, rainy and overcast the next, but it's quite humid here and the plant survived winter fine. What am I doing wrong? I love plants but if I kill even cacti I'll need to give up in disgrace.
No such thing as a kill-proof plant (sanseveria, the snake plant, comes the closest, I think,) and cacti are very easy to kill. Most people either water them too much, or not enough. Here's the thing you're not doing - you're not checking the soil moisture in the bottom of the pot before you water. This article will give you some ideas about that: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
Kept indoors, it will need to have the soil get completely dry all the way down. However, as soon as it gets dry, it needs a thorough watering, meaning till water runs out the drainage holes.
Try again. Spreading withering doesn't sound good, but please don't be defeated. Keep trying, and if you learn to test the soil before watering, you might find a whole new world opening.
How do I revive my golden pincushion cactus? I don't believe I have it enough sunlight and wanted to know how to make it come back.
Depending on how far gone the plant is, giving it more light may be enough. For additional care requirements for pincushion cactus, this article will help: https://www.gardeningknowhow.com/ornamental/cacti-succulents/pincushion-cactus/pincushion-cactus-care.htm
Currently I am using it as an indoor plant for flower arranging. When I purchased it the foliage was pale green and then turned silver as though dead. I purchased three further plants two of which went the same way. The third is continuing to produce new shoots. I use for miniature flower arranging as the plant material remains turgid out of water.
It will only survive down to 33F (1.1C) or so. If it goes below that in your part of the world, then you won't be able to grown them outdoors, however a container grown specimen might be possible.It also needs to remain very dry, as they are not tolerant of moist soils.
This article will give you more information on these: https://www.gardeningknowhow.com/ornamental/shrubs/cushion-bush/cushion-bush-information.htm
This article will help you with the care of these plants: https://www.gardeningknowhow.com/ornamental/cacti-succulents/pincushion-cactus/pincushion-cactus-care.htm
I bought a scabosia plant & want to put it in a planter. Is 10 in big enough?
Yes, that should be fine. If it outgrows the container, only go up one or two sizes.
is in 45 years of succulent growing Pot was only 3 1/2 inches but there were 15 or more of the tightly rolled 'cigars'. I carefully dissected one but found nothing recognisable inside.
I suspect the work of an insect, possibly moth cocoons.
https://www.gardeningknowhow.com/garden-how-to/beneficial/cocoon-vs-chrysalis.htm