Here's a great article from Tropica about this plant written by our friend and brilliant aquascaper George Farmer: https://tropica.com/en/articles/bacopa-caroliniana/

Aquarium plant from tissue culture in closed cup.

Bacopa caroliniana originates from US and has been used as an aquarium plant for many years.

Stems become 10-30 cm long and 3-4 cm wide. Apart from relatively good light it makes few demands. Its slow growth rate makes it one of the few stem plants that do not need much attention.

Like most stem plants, it is most decorative when planted in small groups. Easy to propagate by cuttings; take a side shoot and plant it in the bottom. 

Small plants with great success. 1•2•Grow! Are very young plants cultivated and delivered directly from our laboratory. The plants are guaranteed to be free from snails, algae and pesticides and therefore are totally harmless for sensitive shrimp and fish. The range offers unique plants!

Success with your aquarium depends largely on the proper plant choice. In a 1•2•Grow! cup you buy a myriad of plants which can be divided into small portions and cover a larger area. Plants are compact from the start so you will experience a dense and beautiful growth, if you give them the right fertiliser and CO2 from the start! The range is perfect for small and medium sized aquariums, and your patience will be rewarded...