German knotgrass
Botanical name: Scleranthus
German knotgrass
Botanical name: Scleranthus
Description
German knotgrass are low-growing plants that are often used as groundcover or for ornamental plantings in rock and flower gardens. The plants’ creeping growth habit allows them to form around rocks, giving the area the appearance of being covered in moss. German knotgrass produce small flowers in the summer.
Species of German knotgrass
German knotwort
German knotwort (Scleranthus annuus) is indigenous to Eurasia and North Africa, but has been accidentally introduced and naturalized around the world. German knotwort is a “winter weed” that grows in dense mats covering rocky, sandy areas where few other plants can thrive.
Knawel
A common plant in grassland, particularly at higher altitudes. It may be in the form of a mat. Or a multi branched, spreading perennial herb. This species is under review, and new taxa are planned.
Knawel cushion
Knawel cushion is a strong and versatile plant, tolerant of dry conditions and ideal for rock gardens or as a ground cover. Its dense, bright green foliage forms a low mat-like mound with tiny flowers in late spring or early summer. The common name comes from the knob-like shape of the plant, which resembles the knobs of wool used by knitters in ancient times.
Scleranthus brockiei
Scleranthus brockiei are low-growing plants that are often used as groundcover or for ornamental plantings in rock and flower gardens. The plants’ creeping growth habit allows them to form around rocks, giving the area the appearance of being covered in moss. Scleranthus brockiei produce small flowers in the summer.
Perennial knawel
Perennial knawel used to hold extremely high value, as it was a host plant for the Polish cochineal, an insect commonly used to make crimson dye. This wildflower grows in grasslands, sandy terrain, roadsides, and arable ground.
Scientific Classification
Phylum
Vascular plants Class
Dicotyledons Order
Pinks, cacti, and allies Family
Pink Genus
German knotgrass 
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