How to Make Blue Pea Vines Bloom

Provide a blue pea vine with full to partial sun. The vine will not bloom unless it gets enough sunlight. Ideally, it should have morning sunlight and dappled sun or shade in the afternoon.

Grow a blue pea vine where the soil drains well. Add 3 or 4 inches of compost, leaf mold, or another organic matter into the planting bed. For a container-grown blue pea vine, plant it in well-draining, high-quality potting soil, or make your own with equal parts of loam, peat moss, and sand or perlite.

Keep the soil moist. A blue pea vine needs an "abundance of water," according to North Carolina State University. From spring until fall, water a blue pea vine one to three times a week with 1 inch of water; however, do not keep the soil saturated.

Pinch back a blue pea vine to create a compact, bushy plant with many blooms. Pinching back the plant every few weeks will encourage branching and prevent the plant from growing tall and leggy and having few blooms.