Ah, try this stuff! https://www.amazon.com/gp/product/B002DQCEIA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It's like night and day. This is the first year we've actually had a garden because of it. Most of the perennials are gone by early June, but they've all gone completely untouched since we started using this stuff. Your mileage may very obviously, but it works on our deer at least!
https://www.amazon.com/gp/product/B002DQCEIA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
That stuff is natural and works very well.