Mondo grass (Ophiopogon japonicus) is a grass-like perennial groundcover, known for its dark green, strap-like leaves, though black varieties also exist. It is a low-maintenance plant often used for borders, as a groundcover, or between stepping stones. This evergreen provides a dense, continuous visual appeal.
Is Mondo Grass Grown from Seed?
Mondo grass can be grown from seed, though it is not the fastest or most common propagation method compared to dividing existing plants. Division offers quicker establishment and ensures new plants are true to the parent type. Seed propagation, especially from hybrid varieties, may not accurately resemble the parent plant.
Growing from seed is a slower process, taking longer to establish a full groundcover than with divisions. Germination rates can be unreliable, slow, and irregular, potentially taking two weeks to six months. Despite these challenges, growing from seed is a viable option for common varieties like Ophiopogon japonicus.
Preparing for Mondo Grass Seed Planting
Mondo grass thrives in partial to full shade, though it can tolerate more sun if consistently watered, especially in cooler climates. The soil should be well-draining and rich in organic matter.
Mondo grass prefers a slightly acidic to neutral soil pH, ideally ranging between 5.0 and 6.5. Before planting, amend the soil by incorporating compost or well-rotted manure to enhance both drainage and fertility. For seed sourcing, purchase seeds from a reputable company, as they are more likely to come true to type than those harvested from hybrid plants.
Mondo grass seeds benefit from pre-treatment to encourage germination. Soak seeds in room-temperature water for 24 to 48 hours, changing the water daily. This softens the seed coat and improves germination rates. If cold stratification is chosen, seeds can be mixed with damp sand or peat moss and refrigerated for one to two months before planting.
Planting Mondo Grass Seeds
The optimal time to sow mondo grass seeds is in early spring after the last frost, or in late fall. This timing allows the seeds to benefit from cooler temperatures, which can promote better germination. Seeds can be started indoors in trays or sown directly outdoors, depending on your climate.
When sowing, poke holes about 1 inch deep into a seed-starting medium in a tray or into prepared garden soil. Place one seed into each hole and cover it lightly with a thin layer of soil or fine compost. If sowing directly outdoors, aim for spacing the seeds about 1 inch apart, as seedlings will eventually need thinning. After planting, gently mist the soil to maintain consistent moisture without overwatering.
Caring for Mondo Grass Seedlings
After mondo grass seeds germinate, consistent moisture is crucial for the young seedlings. The soil should be kept continuously moist but not waterlogged, as excessive wetness can lead to root rot. Providing adequate light is also important for healthy seedling development; a spot with filtered sunlight or partial shade is ideal.
As seedlings grow, they may require thinning if they are too crowded. This allows individual plants sufficient space and resources to develop. Maintaining a weed-free environment around young mondo grass seedlings is important, as they are vulnerable to competition from weeds.
Applying a light layer of mulch can help suppress weeds and retain soil moisture. If seedlings were started indoors, they can be transplanted outdoors in the spring after all danger of frost has passed. Growth from seed is a slow process, and patience is necessary as it may take several years for a dense groundcover to form.