Plant Science is one of my favourite topics for HL students as it is a real opportunity to link many of the core ideas of Biology together. Think of it not just as a series of out-of-context assessment statements to check off, but as a chance to revise everything you have learned so far.
Consider this diagram of germination. How many links across the syllabus can you make? Try pasting the image into the middle of a large sheet of paper and surrounding it with explanations of all the concepts that link to it. It could form the centrepiece of a Prezi or a concept map, or simply a large revision poster.