hey mary!
Hybridizers say that when you want to store pollen for longer than a day, you use the freezer method. Here's one way that it is described:
1. Use your fingers or a tweezer to remove the stamens from the opened flower (some say anytime from before the tiny pollen pods open to show the pollen, to anytime before it gets above 80-90 degrees or so when the pollen gets too dried out and spent).
2. Remove the tiny pollen pods from their stem and let them air dry on a plate or tissue for 2-12 hours. If possible, keep them in an area that is 70-80 degrees, and place a fan nearby to blow over the area above the pollen (not directly on them) to help with drying.
3. Put the pollen/pods into an airtight container (zip baggie, etc) and place in your freezer. I've seen examples where the hybridizer was able to use the frozen pollen for over a year after freezing it.
4. When you are ready to use the pollen (the intended flower has opened on your other plant) remove the pollen from the freezer. Again, information varies, from anything to using it immediately, or waiting up to 20 minutes for thaw.
5. Its easy to rub a clean q-tip into the pollen (you'll see it on the q-tip) and rub that gently onto the intended flower's stigma. Return any unused pollen to the freezer for later use.
Would love to hear if this works for you ... and ... to hear if there are other takes on how to do it from the great hybridizers here!
