The Time Garden Magic Series, Book 4.

Time and again, the children from Knight's Castle have longed for another magic adventure. But you can't find magic just anywhere. It doesn't just grow like grass. It requires the right place and the right time- Or thyme, as the case may be. For at Mrs. Whiton's house, magic grows wild as the fragrant banks of thyme in her garden. Eliza insists that time doesn't grow, it flies -yet growing in the garden is olden time, future time, and...