Why can't we just plant unpalatable landscaping plantings or use repellents to deter the deer?

Unpalatable landscape plantings and deer repellants are unreliable and short-term strategies. Deer are likely to ignore either the taste or odor repellents in times of food scarcity and overpopulation. Some repellents lose their effectiveness in rain and require reapplication. Long term approaches are needed to maintain deer populations at levels that are healthy for both deer and human. 

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1. What is the city’s deer management program?
2. Why is the city culling deer?
3. What is done with the culled deer?
4. Can the city use nonlethal methods to manage the deer population?
5. Why can't we just plant unpalatable landscaping plantings or use repellents to deter the deer?
6. How can I protect my garden from the deer?