。
She planted roses in the garden.
Literal
She [topic-は] garden [in-に] roses [object-を] planted.
バラ is the Japanese word for rose, typically written in katakana (though the kanji 薔薇 exists, it's rarely used due to its complexity). 庭に is the target location (where the roses end up), を marks the thing being planted. A simple, practical gardening sentence.