New Year's Day

The day before yesterday, I went to Sanshengxiang. It was is a beautiful nursery market of flowers and plants. There were many wonderful and inexpensive fabulous and cheap plants. I hung out went there with my friend there. I was am not a good gardener but I wanted to go out of curiousity so I just looked curiously. My friend bought a small plant as a gift for her classmate.

in English, nursery is a place where plants and flowers are sold so you can use that

I think wonderful is a better word in this case.  Cheap usually means low price and poor quality.  Inexpensive means it is a low price, but can also be good quality.

If Sanshengxiang is the name of the city, then the sentence should be "It has a beautiful..." if the name of the market is Sanshengxian, then "It is a beautifu..." is correct.

New Year's Day

The day before yesterday, I went to Sanshengxiang. There, I saw (It was) a beautiful market with (of) flowers and plants, (. There were) many of which were fabulous and cheap. (plants.) I hung out with my friend there. I am (was) not a good gardener so I just looked on curiously. My friend bought a small plant as a gift for her classmate.

This is a very nice article and your writing is improving, Mars.

New Year's Day

The day before yesterday, I went to Sanshengxiang. It There was a beautiful market of flowers and plants. There were many fabulous and cheap plants. I hung out with my friend there. I was am not a good gardener so I just looked on curiously. My friend bought a small plant as a gift for her classmate.