The Cannonball Mesa top is relatively dry compared to the mesas to the north. Juniper trees are few and scattered, with other plants including Mormon Tea, Cliff Rose, Narrowleaf Yucca, Prickly Pear Cactus, and desert grasses. I saw a few cows grazing up here and it looks like most visitors arrive on horseback.
The return hike took 1:30 hours out of a total hike of 3:10 hours for about 6 miles. My hike was on a 58 F degree early March day and carried and drank 2 liters of water.