Gratiola viscidula (Sticky hedgehyssop)

15 October 2026

Gratiola viscidula is a small North American stem plant sold in the aquarium trade as Klebriges Gnadenkraut, or sticky hedgehyssop. Its narrow leaves form dense green shoots that can be maintained as a low foreground or short midground planting. The aquarium form is typically grown fully submerged, where regular trimming encourages branching and a compact appearance. Identification from trade photographs alone is not absolute, so the stated name should be retained when purchasing from a reputable source.

Appearance and placement

This is a compact, upright stem plant with slender, pointed green leaves arranged closely along the stems. With frequent trimming it can form a low, dense group in the foreground; if allowed to grow upward, it is better suited to the lower midground. Planting several small portions with space between them helps water and light reach the lower stems.

Planting and routine care

Remove the rock wool or gel from tissue-culture material, rinse the plant carefully, and divide it into small portions. Insert the stems individually or in small groups into a nutrient-bearing aquarium substrate, keeping the leaves above the surface. Provide strong, consistent lighting, stable water conditions, circulation, and a complete supply of nutrients. Carbon dioxide is helpful for compact growth and easier carpeting, although results can vary substantially without it.

Trimming and propagation

Trim the growing tips when shoots become tall or shade their bases. Replant healthy cuttings in the substrate to expand the group; side shoots can also be separated and replanted. Remove deteriorating submerged leaves after planting, since some initial melt may occur when the plant changes from emersed nursery growth to underwater growth.

Identification note

The supplied trade name identifies the plant as Gratiola viscidula. Aquarium specimens can vary in leaf size and habit, and photographs do not provide enough evidence to confirm every cultivated form or distinguish all similar small stem plants. The identification is therefore treated as a trade-level identification rather than a definitive herbarium determination.

Plant info

Colors: Green, Light green
Difficulty: Medium
Origin: North America
Usage: Foreground
Type: Stem plant
Growth rate: Medium
Height: 5–20 cm
Light demand: High
CO2: Medium

Gratiola viscidula

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