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Regarding this, how fast does Moss Rose grow?
This excellent choice for the most neglectful gardener is easy enough for a beginner to grow from seed. Unfussy annual moss rose germinates in 10 to 14 days and blooms all season.
Furthermore, do moss roses come back every year?
Although it comes back year after year, rose moss is actually an annual. This plant produces a large number of seeds each year in pods that readily break open when dry. In fact, it is not uncommon to find rose moss plants outside of their normal area for this reason.
Come mid summer, the plants may get leggy and have few flowers. Pinch back the stems to a side shoot, add a small dose of fertilizer, and they should re-grow and flower more for late summer and fall. Moss rose also don't compete well with weeds or other flowers.