Praying Mantis Egg Sacs: Find, Hatch & Release for Pest Control

Egg Sac Basics

• 1 in., rectangular, tan/white, frothy hardened foam (ootheca).
• On twigs, stems, walls, fences, eaves. Easier to spot after leaf drop.
• Up to 300 eggs; ~20% survive to adult.
• Hatch when spring temps warm. Hunt Nov–Apr.

Hatching & Release

• Place in jar with air holes. Indoors: hatches in 4–6 weeks (or immediately if late winter).
• Nymphs = tiny adults, voracious. Release in garden if temps > freezing.
• Separate nymphs (they cannibalize). Feed fruit flies/aphids until release.
• Or refrigerate sac 1 month to delay, then warm for spring release.

Encouraging Mantids

Stop pesticides—they're sensitive. Buy egg sacs if absent. Order late winter for spring hatch.