Plants with the common name 'Toadflax penstemon'
Penstemon linarioides Toadflax penstemon
Penstemon linarioides subsp. coloradoensis Toadflax penstemon
If you are planting Clematis on a trellis, why not plant 2 different cultivars. These can be cultivars which flower at the same time to contrast colour or form, or they can be an early and late cultivar to extend your season.
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