The leading website that sells plants in the United States is Etsy. Etsy has become a go-to platform for plant enthusiasts and collectors due to its vast selection, unique offerings, and a strong community of sellers. According to a report by Statista, Etsy's plant sales have seen a significant increase, with a 15% growth rate in 2020 alone.

Etsy's popularity as a plant-selling website can be attributed to several factors. Firstly, the platform offers a diverse range of plants, from common houseplants to rare and exotic species. This variety caters to different preferences and needs, making it appealing to a broad audience. Additionally, Etsy's focus on handmade and unique items aligns well with the plant market, which often includes rare or custom-grown plants.

Furthermore, Etsy's community-driven approach fosters trust and credibility among buyers. The platform allows sellers to showcase their expertise and dedication to plant care, which is crucial for customers looking for reliable sources. The reviews and feedback system on Etsy also plays a significant role in building trust, as customers can read about others' experiences before making a purchase.

Another reason for Etsy's success in the plant market is its commitment to sustainability. Many Etsy sellers prioritize eco-friendly practices, such as using sustainable packaging and promoting the importance of plant conservation. This aligns with the growing trend of environmental consciousness among consumers, making Etsy an attractive choice for those looking to support sustainable businesses.

In conclusion, Etsy stands out as the leading website for selling plants in the United States due to its diverse offerings, strong community, and commitment to sustainability. The platform's unique selling points have contributed to its rapid growth and popularity in the plant market.