Melampodium divaricatum aka Botn De Oro

Melampodium divaricatum is an annual in the aster family. Gardeners also call it butter daisy or melampodium. Its native range runs from Mexico to Brazil. It grows in regions with a seasonally dry tropical climate. The name Melampodium paludosum is a synonym. This fast-growing plant forms upright clumps and needs little care.

Garden plants reach about 1.5–2 feet [0.46–0.61 metres] tall. They spread about 0.75–1 foot [0.23–0.30 metres] wide. Straight, purple stems hold bright green leaves in opposite pairs. Each leaf is simple, with an oval or oblong shape. The leaves feel soft and slightly fuzzy. Their edges may be smooth, wavy, or lightly toothed. Tall stems can bend or fall over during summer heat.

Yellow flower heads look like small daisies above the leaves. Each head has yellow rays around a darker yellow centre. The heads are about one inch across. Flowers appear from May until the first frost. As old blooms fade, the stems branch and form more flowers. There is no need to remove spent heads. Bees and butterflies visit the blooms. The fruit is a cypsela, though people sometimes call it an achene. Small songbirds, including goldfinches, eat the seeds.

Grow this annual in full sun and soil that drains well. It accepts loam, clay, and soil rich in organic matter. Give it steady moisture, but allow slightly dry conditions. Established plants cope with drought and humid summer weather. Sow seeds outdoors once the last frost has passed. For earlier flowers, sow indoors six to eight weeks before that date. Move young plants outside after the last frost. US growing-zone listings span zones 2–11 for annual use. This does not mean the plant survives winter cold.

Use butter daisy in beds, borders, or groups of plants. It also suits pots, cutting gardens, and gardens for pollinators. Its long bloom season brings colour through summer and autumn. Deer resistance adds to its value in the garden. Plants may seed themselves where growing conditions suit them. Serious pest and disease problems are uncommon, but powdery mildew can occur. Leave room between plants and choose a site with good airflow.