Most spurges (including Christmas poinsettias) are poisonous. These varieties look great in the deer-resistant garden.
Euphorbia cyparissias 'Orange Man'
15" tall
Zones 4-8
Full Sun
Container Gardening: 5" pot
Agressive ground cover with orange-shaded blooms (technically cyathia and involucres) from late spring to midsummer.
Euphorbia myrsinites
6-8" tall by 12" wide
Zones 4-8
Full Sun
Container Gardening: 3" pot
Myrtle spurge. Trailing blue-gray succulentlike foliage is evergreen through the winter. In spring, greenish-yellow flowers (technically cyathia and involucres) appear in 2-3" wide umbels.
Euphorbia palustris
3' tall and wide
Zones 5-8
Full Sun
Container Gardening: 3" pot
Dark yellow flowers in May/June on three-foot willow-leafed stems. Likes moisture, even shallow water, but tolerates dry areas.
Euphorbia polychroma
12-16" tall, 24" wide
Zones 4-8
Full Sun
Container Gardening: Large 5" pot
Mounded clump packed with yellow flowers (technically cyathia and involucres) from midspring to midsummer.