You need to give a specific desert as each desert has a flora that is different from other deserts.
No grass seed grows weeds, grass grows grass. The weeds that are popping up have most likely been there in seed form before you broadcasted grass seed on your lawn.
Cacti are common plants found in deserts in the Americas. Date Palm trees and grass are found in Oasis, the fertile place in the desert.
The grass that grows on most lawns is a perennial. This is because it grows, reproduces, and flourishes over and over and it still stays on your lawn. An example to prove it is a perennial is that if you had a lawn full of green grass and about 2 years later it is still there then it is not a biennial, and if you had a lawn full of green grass and the growing season is over and it is still there then it is not an annual. The only choice left is a perennial.
Sandshrew is one of the most common desert area Pokemon. Use the Area Customizer to change to desert. Then, just sift through the grass for a little bit until you find a Sandshrew.
The largest desert in Southern Africa is the Kalahari Desert. An arid plateau region, which is 100,000 square miles and extends through three countries, it is located near the Orange River. There are many dry lake beds scattered throughout the desert and grass grows in some parts. The Namib desert would be the second largest desert in Southern Africa. Most of the Namib desert is in the country of Namibia.
The hot subtropical desert is the most common type of deserts. They account for about 2/3 of the deserts on earth.
Antarctica
Desert
Some examples of a desert producer would be cacti, shrubs and desert grass.
Dandelions.
Grass