Collinsia heterophylla, commonly known as Chinese houses, is a charming cool-season annual wildflower that typically grows 8 to 20 inches tall with an upright yet softly branching habit, forming loose, airy clumps about 8 to 14 inches wide. Slender, square stems rise from a shallow fibrous root system extending approximately 4 to 6 inches into the soil, allowing the plant to establish quickly in moist, well-drained ground. The foliage is composed of opposite leaves that vary in shape along the stem, a feature reflected in the species name; lower leaves are broadly oval to rounded and measure 1½ to 3 inches long, while upper leaves become narrower and lance-shaped, generally ¾ to 2 inches long. Leaves are smooth-edged or lightly toothed and clasp the stem slightly at their bases. Distinctive tiered flower whorls encircle the stems at regular intervals, each floral tier spanning about 1½ to 2½ inches across, creating the appearance of stacked pagoda-like structures. Individual tubular flowers measure roughly ½ to ¾ inch long, typically displaying lavender, violet, blue, and white coloration with contrasting lips that attract pollinators. Flowering stems may extend 6 to 10 inches above the main foliage, producing a vertical accent while maintaining a delicate overall profile. After blooming in spring to early summer, small seed capsules about ¼ inch long develop and release numerous fine seeds that readily self-sow, often forming naturalized colonies covering areas 1 to 3 feet across under favorable conditions. Overall, Collinsia heterophylla is valued for its moderate height, refined texture, and layered floral architecture, making it well suited to woodland gardens, native plantings, and informal borders where gentle seasonal color is desired.