Laurentia, often encountered in horticulture under or near the name Isotoma, is grown for fine foliage and starry flowers that bring a cool delicacy to containers and borders. The plants are usually tender perennials treated as annuals in colder climates, forming low to mounded habits with narrow, divided, or lightly cut leaves. Their texture is airy and fresh rather than dense, allowing them to mingle easily with trailing plants, small grasses, and summer annuals. The overall effect is refined, especially in pale blue or white forms.

The flowers are typically star-shaped, with narrow petals in blue, lavender, lilac, white, or pinkish tones, carried above the foliage over a long warm season. They have a crisp, open geometry that looks clean in containers and edging, where a mass of bloom can read as a soft haze of cool color. The plant's milky sap can irritate skin or eyes, and parts may be toxic if ingested, so it should be handled with reasonable care. Its beauty is delicate, but the plant is not without botanical defenses.

Laurentia generally prefers sun to part shade, evenly moist but well-drained soil, and protection from frost. It dislikes extremes: drought can stop flowering and scorch fine growth, while soggy soil can weaken roots. In mixed containers, it is useful for weaving between larger leaves and softening pot edges without becoming coarse. In the ground, it works best as a seasonal accent where its small flowers can be seen up close. The genus offers a cultivated lightness: starry bloom, fine green texture, and a cool-toned ease suited to summer compositions that need restraint.

Its cool flower colors are particularly useful in containers that might otherwise become visually hot. Paired with silver foliage, pale petunias, grasses, or dark-leaved sweet potato vine, Laurentia can refine a summer arrangement without dominating it. Regular watering and light feeding sustain bloom, but excess richness may soften the habit. The plant's value lies in its fine scale, so it should be placed where small stars and narrow leaves are not lost among coarser summer bedding.