Companion plants for Sweet Pea
Sweet Pea blooms from May through July. It wants full sun and moderate water. The 8 companion pairings below each state why the pairing works.
Taking over as Sweet Pea finishes

Alkali Sacaton
Shares full sun and low to moderate water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; lower at 3 ft, for the front of the border.

Splitbeard Bluestem
Shares full sun and low to moderate water; blooms in late summer as this one finishes; its seed heads stand through winter, for structure and the birds; lower at 3 ft, for the front of the border.

Blazeaway Heather
Shares full sun and moderate water; blooms in late summer as this one finishes; evergreen, so the bed keeps its shape through winter; lower at 1.5 ft, for the front of the border.

Buffalograss
Shares full sun and low to moderate water; low at 8 in, to carpet the ground beneath; overlaps, then carries the display into late summer; its seed heads stand through winter, for structure and the birds.
Blooming alongside

Yaupon Holly
Shares full sun and moderate water; blooms in mid spring, before this one opens; evergreen, so the bed keeps its shape through winter; taller at 20 ft, for the layer behind it.

Kinnikinnick
Shares full sun and moderate water; opens in mid spring and overlaps into this one's season; low at 8 in, to carpet the ground beneath; evergreen, so the bed keeps its shape through winter.

Candytuft
Shares full sun and low to moderate water; opens in mid spring and overlaps into this one's season; low at 10 in, to carpet the ground beneath; evergreen, so the bed keeps its shape through winter.

Sea Thrift
Shares full sun and low to moderate water; low at 8 in, to carpet the ground beneath; opens in mid spring and overlaps into this one's season; evergreen, so the bed keeps its shape through winter.