。
She grew roses.
Literal
She [topic-は] roses [object-を] cultivated.
栽培する (さいばいする) means 'to cultivate, grow (plants)' — a more formal/technical word than 育てる (which is used for both plants and children). 薔薇 in full kanji again; this pair of characters is famously one of the most complex in common use.