Can someone suggest flowers for my deck that squirrels or rats will not touch?

I need to plant something in my planters on my deck railings that will be in shade/part sun. I even tryed to plant marigolds and something will clip the blooms from the stems. I really want some color for my deck in the summer months.Can someone suggest flowers for my deck that squirrels or rats will not touch?
I've seen so nice Cactus that make a good deck settings. EPIPHYLLUM (ORCHID CACTUS) is a nice plant. Also the following:





ADENIUM OBESUM DESERT ROSE


EUPHORBIA VIGUERI





I hope they fit what you need.





BillCan someone suggest flowers for my deck that squirrels or rats will not touch?
I'm not aware of anything that they won't touch, but we've had good luck tying bird netting over the flower pots. Some of the netting is fine enough that it's not an eyesore. Check Home Depot--they have a decent selection.
pink lace cactus





great summer blooms, cold tollerant to -15, lots of thorns to protect the blooms, looks great in pots because it only grows 6-12 inches tall
Try euphorbias esp. milii type coz they flower a lot but sport thorns.