The Garden Prize — Marina Oliver

Melanie is determined to win the Garden Prize for her dead father's garden, which was his great joy. She resigns her London job as a florist to run The Old Grange guest house for a year, so that the garden can be judged on the three weeks the village gardens open to visitors.
Her former boss Michael offers her a partnership and marriage, her sister Angela wants her to sell the house quickly, and unknown vandals attack her garden. A guest, Paul Hunt, is sympathetic and helpful, but he is mysterious. Can she trust him?

Previously published as Love's Sweet Secrets by Bridget Thorn.