This is the 10633rd most frequent Polish word.
doniczkami
"Doniczkami" means "flower pots" (instrumental plural form in Polish).
The word 'doniczki' is the plural form of 'doniczka,' meaning 'pot' used for plants. In this sentence, it refers to the objects being placed.
Postawiłem dwie doniczki na parapecie.
I placed two pots on the windowsill.
Here, 'doniczki' indicates multiple pots intended for garden use, emphasizing the object to be purchased.
W przyszłym tygodniu kupię nowe doniczki do ogrodu.
Next week, I will buy new pots for the garden.
In this context, 'doniczkami' appears in the instrumental case, used to describe an action involving the pots.