Are deer eating my canna lilies?

It probably is the deer. There are sprays you can get from your hardware or land and garden stores that will repel the deer.

Could well be deer. I have a lot of deer and wake up some mornings with miserable-looking plants like these, even on my deck. How about taking one or two leaves down to your local nursery and asking them what they think? My nursery is great like this and always willing to help. Also try Liquid Fence Rabbit and Deer Repellent. It does stink like rotten eggs, but does the trick when I can remember to spray it. Use it down wind, walk backwards then rush indoors!!!

Use the lid from a jar, place upside down near the plant. Fill with beer. If it is slugs, they will drown in the beer. I lost a bunch of plants to slugs.

Deer in my area don't eat that selectively. They don't clean off stems by delicately eating the leaves. They do trim back my knockout roses - stems, thorns and all - when I forget to scatter Original Irish Spring shavings around the flower bed. I'd look into other critter possibilities that eat big leaves a little at a time. Grasshoppers, maybe?

That looks more like grasshopper damage. Dust with Sevin after dark, to not kill bees.

Looks more like bugs than deer.

A trick that comes from Sweden is hanging white paint lid tops at the level of white tail deer tails...they lift their tails to show the white underside when alarmed or trying to warn others of danger. I've also heard of hanging dryer sheets in the garden - it may be the same pronciple and the smell would add to deterring deer.

Could be deer--they eat just about anything-- but I agree it looks more like bugs or slugs. Some of the chewed leaves look like they are pretty deep into the branches of the other plant and would be have been hard for a deer to get to. (And with unchewed outer leaves still available why would a deer try to go deep?) Plus as others have said deer usually don't nibble like that. They chop off "chunks/hunks" at least in my experience. Rabbits sometimes do nibble off the more tender parts of leaves though. I'd start with beer and see if you catch slugs.

Deer love lilies of any kind and it looks like they certainly like yours. Here is a home spray for you to use to deter them. Use a one gallon jug, put 1 Tablespoon of dish liquid in it, one egg and 1/2 cup milk and fill up the jug with water. Shake well and then put some in a spray bottle. Use this regularly and especially after a rain and they will not eat your plants. It may even deter the bugs as well. Hope this helps!

My canna lilies look like yours starting in mid-June but the eaten part is above a deer’s head so I’d say it’s definitely not deer. There is a caterpillar known as a canna leaf roller that does some pretty big damage. There are ways to control it. Do a search on “Canna leaf roller” for detailed info.

Deer don't like the smell of eggs. Use egg whites & mix with a bit of water (2 whites to a cup of water) & spray it where you don't want deer. You'll have to rinse your sprayer nozzle often, but it works.

It is definitely not deer! You have arborvitae along with your canna lillies! This is a favorite of deer. It is not touched! You have some type of insect eating your cannas! You might want to look on the underside of your leaves and do research. Usually it is a caterpillar problem with pictures like yours. Therefore it is not always necessary to use an insecaside. You simply need to pick off the culprits. Other pests are slugs and snails which leave a slime trail.I can't see any trail of slime from your pictures. That would be a telltale sign.Happy Gardening☺️

PS it is best to look for the caterpillar 🐛 during the evening . They tend to hide during the day!

Little late to the game, but Big Back and Yellow Grasshoppers did this to mine.