I have never attempted pollination. I've always chucked the males or only utilized feminized seeds. Now that I've found a few strains that I want to always have available, it seems a little silly to keep buying those seeds. I've read what's available on GWE. But how do you determine when to collect the pollen? I assume too soon may not allow enough time for the pollen to form, and waiting too late may allow unwanted pollination. Is there a good "rule of thumb" to follow for timing collection? Thanks in advance!