Cactus……?

desert. water about every 7 – 10 days…depending on the rain fall in your area.
if you will add one more element – another cactus on a small stone – in the center you will have a more pleasing container garden.
rule of thumb is to use odd numbers – 3, 5, 7, etc. for some reason it is ‘easier’ on the eye, so to speak.
hope this helps.

I live in the “desert” in Arizona. I have never heard of a tropical cactus. A cactus is a cactus. What you have are standard varieties available at grocery stores & garden centers. The one with the colored top is a “Star Cactus”, The hairy one is sometimes referred to as “Old Man.”

It looks like the pot that they are in is way too large. When you see cactus dish gardens there is a reason that they are in really small containers. Cactus are very slow growers, I mean slow…. years. They have very little root structure as they rely on every drop of surface rain in monsoon storms to supply their storage water system until the next rain.

Cactus that size you want to give maybe a tablespoon to each plant once per month. You may have increase this slightly just because of the pot size. Use a specific cactus mix, not potting soil and cactus fertilzer, not houseplant when you do. Shallow clay pots with drain holes are best.

You have to adjust them to full sun just like any other plant. They are nursery raised so the have always been under protection from the sun. Do provide good southern exposure lighting but not too close to southern window as to burn them.
In the desert when we transplant cactus you actually have to mark them, north, south so they get planted in the same exposure positions or they burn up.

Good Luck

Tropical cactus can grow in varied soil and climatic conditions. They don’t require more water and wlll grow very well under the sun or partially shaded condition.