It is a great idea! I have a tendency to make planters for small plants out of everything.
All types of cacti grow slowly, they are great to plant in anything, but my favorite is in soufflé ramekins, and also ivy in glass bottles, and I made tea cups filled with this cute plant (larmes de bébé in French - I know it's not baby's breath in English, but I have no idea of the name) for a friend last Christmas.
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