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, 20.0224072WH-M, height 470mm, 20.0224072WH-L, height 520mm): 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 

Flowerpot:
TREEZ Effectory Flowerpot - Terra - Middle bowl - Gray beige (height 680mm): https://treez.ru/cat/good/41.33-22-24-114-RB.html 
TREEZ Effectory Flowerpot - Terra - Classic Bowl - Gray Beige (height 500mm): https://treez.ru/cat/good/41.33-22-24-112-RB.html 

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 not lower than 1.5, since the glossiness of materials is configured taking into account PBR.