Need help with storing plants..

ok so i have 3 plants in flowering. 1 plant however has been flowering 13 days longer than the other 2, so i will harvest this plant first.

Anyway, i want to make some cannabutter but i want to make it with all three plants at the same time.. is there a way i can store the stalks, leaves, etc of the first plant until the other two get done? i heard if the leaves dry too long they turn brown and get crispy and you can use them for cannabutter

let it dry and keep it in a jar to cure as you normally would until the others are done, dry and ready to do the same with.