Help me come up with a periwinkle experiment please! :o)?

Question

I have 4 periwinkles and I need to come up with some sort of an experiment that can take place over a time period of 7 days. What should I do? I can't decide. I'd love to hear your ideas.

Answer 1

Periwinkle, as in vinca minor?

See how long they can grow in that space of time.  Periwinkle is considered an invasive plant since it can grow so fast, so you can try and see how long it grows, if it sends out new leaves, how different soils effect it.

You could also see if cuttings from your periwinkle will root in that space of time, how long the roots get, and what medium does best for rooting.