The stem-and-leaf plot represents the number of flowers in different public gardens throughout the city. How many gardens have at least 18 flowers, but fewer than 30 flowers?

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A stem-and-leaf plot with a stem value of 1 with a leaf value of 5, 5, 6, 6, 7, 7, 8, 8, a stem value of 2 with a leaf value of 1, 4, 5, 9, and a stem value of 3 with a leaf value of 0, 5, 5, 6.

Key: 1|5 means 15