Is there something I can do to make it not leak?

Ours went flat regularly. It was mainly due to building a home in the AZ
desert with all its various cactus 'spines'.

I patched the tube about 5X then gave up and bought the new one on sale 50%
off at HFT for $ 4.99
A friend said to put green "Slime" (bike and M/C shops have it, perhaps also
Walmart) into the tire but I don't know if it works with tube type tires or
just tubeless.

R