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? Enter your answer in the box. 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