Propagating Softstem Bulrush (Schoenoplectus tabernaemontani)

How to propagate softstem bulrush by rhizome division and seed. A tall, emergent marginal pond rush for waterlines and paludariums, not a submerged plant.

Overview

Schoenoplectus tabernaemontani, the softstem bulrush, is a perennial sedge that produces dense stands of many narrow, erect stems reaching 1 to 1.5 meters tall. The stems are circular in cross-section with a chambered pith, and the leaves are mostly basal and usually underwater. It grows from a long rhizome system and flowers in early to mid summer.

Propagation Method

Softstem bulrush reproduces through its extensive underground rhizome network, so rhizome division is the primary and easiest propagation method. Lift an established stand and split the long rhizome into rooted sections, each with its own stems. It can also be grown from seed, as the plant fruits in late summer through early autumn.

Step-by-Step

Lift a section of an established stand together with its long rhizome and roots.
Wash away loose substrate to expose the rhizome and the points where stems emerge.
Cut the rhizome into divisions, each bearing roots and at least a few healthy stems.
Replant each division into wet substrate at the pond margin or paludarium waterline, anchoring the rhizome.
Keep the base saturated and the substrate constantly wet while roots re-establish.
For seed, collect ripe fruit in late summer and sow onto moist substrate, keeping it wet until germination.

Conditions for Healthy Growth

This is a cosmopolitan, undemanding species suited to beginners. It tolerates a wide temperature span of roughly 8-28 degrees Celsius and a pH from about 6.5 to 8.5, and it copes well with brackish conditions. Give it bright light and a permanently wet substrate; its fast growth is supported by moderate nutrient levels.

Maintenance

Because it is fast-growing and can reach 1.5 meters, expect vigorous spread from the rhizome. Thin the stand regularly, remove old or damaged stems, and divide the rhizome when clumps become congested to keep the planting tidy and to produce new plants.