I scaled the original woven planter file up to 120% (100mm tall), but even if you don't this should still work. The cactus will just be larger in proportion and not sit as deep in the planter. 

The base piece can be printed in the orientation as downloaded, no supports required. 

Make sure to adjust the cactus in the slicer to actually sit on the flat edge. By default after opening the .stl it's slightly angled. But no supports are required. 

The main stalk uses a flower bud at 100% scale, I scaled one down to 80% for the larger arm and 60% for the smaller arm. I recommend printing them at a slower speed and with a brim if you're having trouble, since they are tiny.

I used Duramic Army Green PETG for the cactus and Atomic Shiny Pink PLA for the flowers, but of course any colors work. The planter and base I used Novamaker Wood PLA.