Cactus growth

[schmiggle]

I've had what I think is a Glandulicactus uncinatus or G. wrightii since early October, and it hasn't changed in the slightest, at least above ground. I water it once every other week, it's in well drained soil topped with gravel, it's very over potted (a good thing, I assume, since I've read this species has a taproot), and it certainly doesn't look unhealthy--it's turgid and green. It definitely gets plenty of light--it gets only slightly less than my sundew, which is doing great. Do cactuses always seem to exist in a state of suspended animation? Should it be growing more? Etc...

 

[The Snark]

Glandulicactus uncinatus, close relative of Fish Hook cactus. They don't grow in winter and shouldn't be watered then or only once or twice. Growing season is typically short, about 4-6 months, and speed of growth depends upon both temperature and amount of direct sunlight.
It's a fast grower, compared to certain Cholla, and can grow as much as 6 inches a year in hot climates. (Some Cholla grow 1/2 inch per year.)

 

[Galapoheros]

I have cacti for 10 or so years that I can't tell have changed in size. Have you looked up the typical end-size of what you have?

 

[schmiggle]

It gets 6-8" high and about 3" wide, though fairly slowly. Right now it's about 2" high and 3" wide