Check the nodes where branches meet the main stem
Male plants form small round pollen sacs
Female plants form teardrop-shaped calyxes with two white hairs
Male sacs usually hang downward
Female pre-flowers usually point upward
Look for clusters of sacs to identify males
Look for pistils to identify females
Inspect plants during the pre-flower stage
Use a magnifying glass for early identification
Separate males quickly if you want to avoid pollination