Juncus balticus aka Baltic Rush

Juncus balticus, or Baltic rush, belongs to the rush family, Juncaceae. Its native range covers Europe and much of the Americas. This includes North and Central America, reaching southern South America. The RHS records it as native to Britain and Ireland. It grows in temperate regions and favours damp or wet ground. Its wild sites often have salty soil.

This perennial grows fast and reaches about 3.3 feet [1 metre]. It spreads through underground stems and can form large clumps. Its roots can spread strongly, which matters in small planting spaces. The evidence gives no firm width for a mature clump. It flowers from June to August. Each flower has both male and female parts. Wind carries the pollen. The seeds are very small.

Baltic rush suits a bog garden or a pond edge. It grows in moist ground and can stand in shallow water. PFAF describes it as easy to grow under these conditions. It prefers heavy soil but also grows in loam. Full sun and light shade both suit it. It accepts mildly acid, neutral, and mildly alkaline soils. It also tolerates salt in the soil. PFAF lists UK zone 3 for hardiness. That scale should not be read as an RHS H rating.

Gardeners can raise it from seed or divide established clumps. Sow seed on the compost surface in early spring. Use a cold frame and keep the compost moist. Move seedlings into separate pots once large enough to handle. Strong plants can go outside in summer. Keep slower seedlings until late spring of the next year. Divide clumps in spring. Large divisions can go straight into their final sites. Grow small divisions in pots until they root well.

The stems have uses beyond the garden. People use them for baskets, mats, and thatch. The stem bases provide a pale yellow-brown colour in basket work. PFAF gives the plant a low food-use rating. It lists the seeds as edible, but gives little detail. A sugar deposit near the plant's top has served as a sweet. The stems have also supplied a fermented drink. PFAF lists no known medicinal use. It reports no toxicity records for this species. That does not establish that all uses are safe.