Mimulus cupreus 'Red Emperor' is a cultivated variety of Mimulus cupreus, commonly known as Copper Monkeyflower. It is a perennial herbaceous plant known for its stunning coppery-red flowers. Here's a detailed description and care guide for Mimulus cupreus 'Red Emperor':

Description:
Mimulus cupreus 'Red Emperor' typically grows to a height of 12 to 24 inches (30 to 60 cm) and forms a clump of upright stems. It features lanceolate, dark green leaves that have a slightly toothed margin. The standout feature of this variety is its striking tubular flowers, which are a deep coppery-red color. The flowers are two-lipped, with a spotted throat, attracting pollinators such as bees and hummingbirds. 'Red Emperor' blooms in late spring and early summer, adding vibrant color to the garden.

Care Guide:

Lighting: Mimulus cupreus 'Red Emperor' thrives in partial shade to full sun. It prefers a location with filtered sunlight or a few hours of direct morning sun, especially in hotter regions. However, it can tolerate some shade, which can help protect the flowers from intense sunlight and extend their lifespan.

Water: Copper Monkeyflower prefers consistently moist soil conditions. It appreciates moist, well-draining soil but can tolerate brief periods of wetness. Water the plant regularly to keep the soil evenly moist, especially during dry spells or periods of high heat. Avoid overwatering, as this can lead to root rot.

Soil: 'Red Emperor' prefers fertile, loamy soil with good drainage. It can tolerate a range of soil types, including clay or sandy soil, as long as it drains well. Incorporating organic matter, such as compost or well-rotted manure, into the soil before planting can improve its fertility and moisture retention capabilities.

Temperature: This variety of Mimulus cupreus is hardy in USDA hardiness zones 8-10. It prefers mild temperatures but can tolerate some heat. In hotter regions, providing partial shade during the hottest part of the day can help protect the plant from excessive heat stress. Mulching around the plant can also help maintain soil moisture and regulate temperature.

Fertilizer: 'Red Emperor' generally does not require heavy fertilization. A balanced, slow-release fertilizer applied in early spring can provide the necessary nutrients for healthy growth and blooming. Follow the manufacturer's instructions for dosage and application methods. Avoid over-fertilization, as it can result in excessive foliage growth rather than abundant flowers.

Maintenance: Copper Monkeyflower is relatively low-maintenance. Deadhead spent flowers to encourage continuous blooming and prevent self-seeding. Trim back the plant after blooming to promote fresh growth. Regular division can be done in early spring to propagate the plant and maintain its vigor.

Pests and Diseases: Mimulus cupreus 'Red Emperor' is generally resistant to pests and diseases. However, it may occasionally attract aphids or spider mites. Monitor the plant for any signs of pest infestation and take appropriate measures if necessary. Good air circulation and proper spacing can help prevent the development of fungal diseases, especially in humid conditions.

By following these care guidelines, you can successfully grow Mimulus cupreus 'Red Emperor' in your garden. Adjust the care routine based on your specific growing conditions and monitor the plant for any signs of stress or pest infestation. With proper care, 'Red Emperor' will reward you with its stunning coppery-red flowers, bringing a splash of vibrant color to your garden.