A charming story, though do be careful, because it could be somewhat frightening to little kids. And it certainly perpetuates the "swallow a seed, grow a plant inside" superstition common among little ones. But if they can get past that, it's a visually appealing piece, which is perfect for an afternoon read.
Irene's father is a master gardener, but sometimes his growing powers can get out of hand. When he accidentally drinks a glass full of seeds, he transforms into a tree. At first, it's interesting, but as time passes, and he becomes more wooden and unable to interact with his family, Irene grows scared, and wishes she had her father back to normal.
It all has a happy ending, in line with the magical realism theme. So, hopefully your kids will be soothed, rather than frightened. Perhaps use this for class storytime, and lead into a unit on growing plants from seeds. Just make sure no one swallows them!