In the past I have had trouble when a cactus has come up as a prop needed onstage. I once gave up and bought a real live aloe vera plant, which the stage manager had to be responsible for caring for over the run of the show.
During my work on this show though I realized that small fake cacti are actually very easy to purchase, I was just looking in the wrong place.
You won't find cacti in the craft stores where I buy most of the rest of my fake greenery, but you will find a large selection of very inpressive fake cacti at pet stores. They are sold for people to put in terrariums with pet lizards and snakes and such.
I love awesome discoveries like this.
And will certainly be using more in the future.
For this particular prop I had another interesting challenge after finding the cacti.
There is a bit in the show where one character is over watering the cacti on his desk and killing them. He needed to be able to put a full cup of water into the dish holding the cacti without it overflowing.
To help with this, I used a sponge to create the sandy soil that the cacti were planted in.
With scissors and a matte knife I carved out the sponge to fit the tin I was using for a planter, and to fit around the base of the cactus plant.
Because of the precise fit (just slightly larger than the tin so it would squish in and hold) neither the sponge or the plant needed to be glued in. This makes it easy for the run crew to take out the sponge, and squeeze it to remove the water between scenes, allowing the actor to continue pouring more water in without a risk of overflowing.