Colocasia ‘Midori Sour’ is an appealing plant, recognized for its striking foliage and inclusion in the “elephant ear” plant group (Colocasia esculenta species). This herbaceous perennial hybrid is valued for its unique aesthetic contribution to tropical landscapes. Its large, heart-shaped leaves display distinctive variegation, often featuring lime green with darker green marbling or blotches, and sometimes hints of gold or purple. A purple spot frequently marks where the leaf joins the stem. The plant typically reaches a mature height of 3 to 6 feet, making it a prominent feature in gardens or large containers.
Colocasia Midori Sour Growing Conditions and Care
Light Requirements
Colocasia ‘Midori Sour’ thrives in light conditions that influence its vibrant leaf coloration. While it can tolerate full sun, its unique gold, purple, and variegated foliage displays the best color in partial shade. Bright, indirect light for most of the day is generally beneficial. Too much intense, direct sunlight can cause colors to appear pale or fade, especially in warmer climates.
Watering Needs
Consistent moisture is important for Colocasia ‘Midori Sour’. The plant prefers evenly moist soil and should not dry out between waterings. It can even be grown as a pond marginal or in water gardens, highlighting its preference for abundant water. Monitoring soil moisture to keep it consistently damp but not waterlogged supports healthy root development and plant vigor.
Soil and Potting
A rich, well-drained soil mix provides an optimal environment. The plant benefits from fertile, moisture-retentive soil, supporting rapid growth and large leaf production. A mix that includes compost, peat moss, or coconut coir can be beneficial. When potting, select a container that accommodates its potential mature size, allowing for adequate rhizome expansion. It can also grow successfully in garden beds, requiring ample space.
Temperature and Humidity
Colocasia ‘Midori Sour’ is a tropical plant, performing best in warm temperatures. Ideal temperatures range from 65 to 90 degrees Fahrenheit (18-32°C); it does not do well below 50°F (10°C) for extended periods. Like most Colocasia, ‘Midori Sour’ appreciates high humidity. Average household humidity may not be sufficient, so increasing ambient moisture through methods like using a humidifier, grouping plants, or a pebble tray can be beneficial.
Fertilizing
Adequate nutrition supports vigorous growth and large foliage. During the active growing season (spring through summer), apply a balanced liquid fertilizer regularly. Diluting the fertilizer to half-strength and applying it every 2-4 weeks supports healthy growth. A high nitrogen fertilizer can result in larger leaves. Cease fertilization in late summer or early fall to prepare the plant for dormancy.
Troubleshooting Common Colocasia Midori Sour Issues
Yellowing Leaves
Yellowing leaves can indicate several issues. Overwatering is a common cause, as soggy soil can lead to root problems and nutrient uptake difficulties. Insufficient watering can also cause leaves to yellow and wilt due to drought stress. Nutrient deficiencies, particularly lack of nitrogen or iron, may also cause yellowing. Natural aging of older, lower leaves as new growth emerges is also normal.
Drooping or Wilting
When leaves begin to droop or wilt, it often signals a lack of water. The large leaves transpire significant moisture, making consistent hydration important. Excessive heat, especially with dry soil, can also cause wilting as the plant tries to conserve water. Root damage from overwatering or root rot can impede water absorption, leading to similar symptoms even if the soil appears moist.
Pests
Colocasia ‘Midori Sour’ can encounter common garden pests such as spider mites, aphids, and mealybugs. Spider mites cause tiny stippling and fine webbing on leaves, particularly on the undersides. Aphids are small, soft-bodied insects that cluster on new growth, while mealybugs appear as white, cottony masses in leaf axils. For minor infestations, a strong spray of water or insecticidal soap can effectively manage these pests.
Winter Care and Dormancy
Colocasia ‘Midori Sour’ is a tropical perennial that typically enters dormancy in colder climates. In USDA Zones 7a to 10b, it may survive outdoors with mulching, but in regions with freezing temperatures, winter protection is often required. As temperatures drop in autumn, foliage will naturally die back, signaling dormancy. This is a normal part of its life cycle, as the plant conserves energy in its underground corm.
To overwinter, the corm can be dug up before the first hard frost. After lifting the corm from the soil, brush off excess dirt and trim foliage back to a few inches above the corm. Allow the corm to dry for several days in a cool, well-ventilated area to prevent rot. Once dry, store the corm in a cool, dark, dry place (e.g., basement or garage) in a breathable material like peat moss or sawdust until spring.
Alternatively, if in a container, Colocasia ‘Midori Sour’ can be brought indoors before cold weather. While indoors, the plant may continue to grow, though slower due to reduced light and humidity. Watering should be significantly reduced, allowing the topsoil to dry out between waterings to prevent root rot. Place the plant in a bright, indirect light location, protected from cold drafts.