Poinsettia `721` is a new cultivar, distinguished by bright red flower bract, dark green foliage, self-branching characteristics, uniform growth habit and 9-week flowering response time. The new plant produces a very desirable branched flowering pot plant for the mid-season holiday market. Poinsettia `721` is resistant to epinasty after being confined to shipping containers. The post-production foliage and bract retention is excellent even under low light intensities in the consumer's home.