Yes, horses will eat those plants if planted on a fence line. They will not eat them as a primary forage but will graze them from time to time. I don’t think they will bother the climbing rose bushes once they feel the thorns. To my knowledge, rose bushes and trumpet vines are not poisonous to horses. You can make your own decision, but it is probably not a good idea to plant them along your fencerows close enough that the horses can reach them.
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This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.
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