Egg-based scent repellents for deer
These actually work. The catch is the word 'reapply', and it is the word everybody quits on in August.
What it is
Putrescent egg-solid sprays. They smell like a predator ate something nearby, which triggers a deer's strongest instinct rather than merely annoying it.
The numbers
- Egg-solid repellents consistently outperform most other repellents in comparative testing — they work on fear, not taste.
- They must be reapplied after rain and as new growth appears, because the new leaf came out unprotected.
- Capsaicin (hot pepper) sprays are taste-based, also real, also wash off — and not for anything you're about to eat.
Why it's here
Because there is a legitimate place for a repellent: protecting something small and valuable — a few young fruit trees, one bed, a new planting through its first vulnerable spring — where a fence isn't worth building yet.
The automation angle
Tie the reminder to your own rain gauge rather than to a calendar. 'Reapply after 0.5 inches of rain' is a rule a weather station can actually enforce, and it's the rule people fail.
The catch
It is a chore, not a barrier, and the failure mode is entirely human. Repellents also lose ground when deer pressure is high and food is scarce — a hungry deer in February will eat through a smell. For anything you'd be genuinely upset to lose, build the fence; use the spray to get through the season until you do.