Once the plants get close enough to the flowers opening, you can cut off the branches and stick them in a vase of water. Put a mirror or piece of glass under the vase and the pollen will drop off the flowers and be easier to collect.
Alternatively you could put a bunch in a paper bag and shake it around .
The biggest thing is to keep it dry after you collect it since moisture will kill its viability.
Alternatively you could put a bunch in a paper bag and shake it around .
The biggest thing is to keep it dry after you collect it since moisture will kill its viability.