Grass pink

Grass pink (Calopogon tuberosus) is a perennial terrestrial orchid belonging to the Orchidaceae family. It is distinct from the common tropical orchids found in homes, as it is a soil-growing species adapted to highly specific, wet environments.

The plant is native to North America, ranging from Canada through the eastern United States to the Gulf Coast. In its natural habitat, it thrives in wet meadows, pine barrens, and sphagnum bogs, where the environment is characterized by acidic soil and abundant moisture throughout the growing season.

Botanically, it is defined by a small corm (tuber) that stores energy, allowing the plant to survive dormancy. It produces a single grass-like leaf and a tall, slender inflorescence bearing several pink to magenta flowers. A notable botanical trait is the non-resupinate flower, where the lip is positioned at the top, covered with colorful, hair-like structures.

Agrotechnical requirements focus heavily on soil quality and water purity. The substrate must be acidic, well-draining, yet consistently moist. Growers should use a peat-sand mix and avoid tap water, which can alter the soil pH; distilled, rain, or reverse osmosis water is preferred to maintain the plant's health.

Its primary use is in the niche horticultural market, specifically for specialist collectors and those building bog gardens. While not an agricultural crop in the traditional sense, it is valued for its unique aesthetic in ecological landscaping. Pests and diseases include aphids, spider mites, and fungal pathogens like root rot, which typically occur if the planting site lacks sufficient air circulation.

• Sun exposure: full sun to partial shade.
• Watering: keep the medium constantly moist.
• Soil pH: acidic (4.5–5.5 range).
• Maintenance: requires low-nutrient substrates to avoid fertilizer burn.