Having bared the harsh desert lands, and survived the painful heat, you have become accustomed to these rough environments, granting you +2 Constitution. (To a Maximum or 20)

Cactus sometimes have this cute little flowers on their tops, so you get a lovely +1 to Charisma (To a Maximum of 20)

You are covered "Head" to "Toe" in spines and spikes, these spikes are great for close quarters combat, this gives you the following benefits:

While you are grappling an enemy, at the start of the enemy's turn they take 1d4 Piercing damage.

When you make an Unarmed attack, they deal 1d4+Str Piercing damage instead of the normal damage.

Due to your impeccable ability to store water, you only need to drink water once every 20 days, allowing you to go long periods of time without liquid.

You do not require food, but you do require being in direct sunlight for 1 hour a day, or you will take a level of exhaustion. Spells and Cantrips which create Bright Light can also grant this effect, but you must spend 2 hours in them. Don't want to die from no food.

You know Common and 1 other language of (the wizard who awoke you.) Your choosing. I mean, Cacti don't have their own language do they?

Due to being a plant, you can very easily hide in appropriate foliage or surroundings, while you are standing in a plant pot large enough for your whole body, or while in a dry, desert like environment, you have advantage on Stealth(Dexterity) Checks to Hide

You waddle along at the blisteringly fast speed of 25ft

Being a Plant, spells which affect plants also effect you.