Most poisonous garden plant?
What is the most toxic plant that can grow in light shade? I have a huge bare spot in my yard outside the fence, because the deer ravage whatever I put there, even though with the late rain we've been having this year there is still plenty of greenery for them to feast upon out in the woods. Why don't they touch the French Broom I have to pull up every year? I've tried various sorts of garden plants that were supposed to be poisonous and deer-proof - Solanum, Nicotiana, and a few different lilies, but the deer eat them anyway. Not just once, but they eat them again once the plants try to grow some new leaves. So much for these plants being poisonous.
Anyway, I need something EXTREMELY toxic to plant there, something that will make the deer a bit sick so hopefully they'll learn to stay away. Preferably something evergreen and with showy flowers, since this particular spot is under a large Myoporum laetum tree and gets only dappled sunlight throughout the day (so it looks pretty dreary as it is). What about Castor Bean? I know that's supposed to be pretty toxic, but is it only the seeds? I can't find much about the foliage being a deterrent. Foxglove would basically be a last resort for me since it's so incredibly common around here and I'm interested in more unusual plants. Has anyone had success with ornamental rhubarb?
I live in a rural area, so there's no chance of children or dogs eating the plants and getting sick. There's only deer here, and I need something that will keep them at bay.
Thanks in advance for any help! I'm at my wit's end with these rats on stilts!