Hi Lori,  there is no, single best way to limit deer browsing in flower beds, or other parts of our gardens.  Combining techniques usually yields the best results. Controls can include physical barriers (fences, tree wraps), repellents (blood meal, bone meal, predator urine sprays), use of, or interplanting with plants least likely to be browsed (such as lavender, daffodils, peonies, astilbe, senna, nodding onion, alliums) and devices, or techniques that scare the deer (sprinklers, noisemakers that go off when motion is detected for example).

Where feasible a tall fence works very well. Repellents require frequent application to remain effective. Effort and expense are an important part of making your choice. I've attached a couple publications, and included links to other resources that will help you decide which options will work best for you, and your garden. 

https://u.osu.edu/pauldingmgv/2021/05/07/the-elusive-deer-proof-garden/

https://extension.oregonstate.edu/news/herbs-rescue-fend-deer-aromatic-plants

Hi Lori,

Coffee grounds are not a reliable repellant for deer, neither do they attract rodents. There's some evidence that bears find coffee grounds attractive:

https://blog.zoo.org/2011/08/bear-breakfast-coffee-fruit-and-honey.html#:~:text=Why%20coffee%20grounds%3F,like%20a%20cat%20in%20catnip 

The easy way to use coffee grounds year round is to dump them into your compost pile with your other kitchen and garden waste. There are other ways to use coffee grounds as a soil amendment. This Washington State extension fact sheet provides science based guidance on how to use coffee grounds in your garden: https://pubs.extension.wsu.edu/using-coffee-grounds-in-gardens-and-landscapes-home-garden-series