All these plants and flowerpots are not just 3D models, but 3D models for which there are real analogues, and they can be purchased for landscaping your projects from the Treez Collection company.

Plants:
Alpine grass with white flowers (3 sizes) (20.0224072WH-S, height 400mm): https://treez.ru/cat/good/20.0224072WH.html 
Lemongrass grass dusty green in a pot (20.0224070GG, height 700mm): https://treez.ru/cat/good/20.0224070GG.html 
Lemongrass green grass in a pot (20.0224070N, height 700mm): https://treez.ru/cat/good/20.0224070N.html 
Lemongrass grass green tall in a pot (20.0224071N, height 850mm): https://treez.ru/cat/good/20.0224071N.html 

Flowerpot:
TREEZ Effectory Flowerpot - Organic - Low Bowl - Glacier Gray (height 210mm and 290mm): https://treez.ru/cat/good/41.33-15-23-099-GR.html 
TREEZ Effectory Flowerpot - Organic - Sphere - Dark Gray Stone (height 500mm): https://treez.ru/cat/good/41.33-15-23-098-BLCK.html?SECTION_ID=4148 


Those who work in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, the BRDF field will be empty. Select Blinn, Phong or Ward - what is preferable for you.

For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR.