Rorippa amphibia - Great Yellow Cress

Family:	Cruciferae
Habit:	Perennial
Height:	1.2
Synonyms:	Nasturtium amphibia. Sisymbrium amphibia.
Range:	Most of Europe, including Britain, to N. Africa and Siberia.

Rorippa amphibia (Great Yellow Cress) is a Perennial which grows to a height of 1.2m . It has a hardness rating of 6and is vunerable to frost.
Great Yellow Cress will flower in December to February. the seeds ripen from January to March
The flowers from this plant are hermaphrodite (has both male and female organs) and they are pollinated by Bees, flies, self

Soil Information

Great Yellow Cress will grow in light (sandy),medium (loamy),hard (clay) soil. It is not necessary for the soil to be well drained.
The soil prefers the following PH / acid levels :
- pH of less than 6, Acidic soils
- pH between 6 and 8, Neutral soils
- pH greater than 8, Basic soils
Great Yellow Cress prefers soils

Ideal Planting Locations

Great Yellow Cress can grow in semi or areas with no shade.

By ponds, ditches and streams, often in water, in acid or calcareous conditions[17].

Planting places suited to this plant described below.

• Is a pond plant
• A bog garden plant

Cultivation Details

Prefers a fertile soil[200]. Tolerates fairly low light levels[200]. Plants grow in boggy soils or in shallow water, the submerged forms have finely divided bright green leaves[200]. Plants seem to be extremely attractive to slugs. They can eat out all the new growth in spring and kill even large plants[K].

Edible Uses*

* See disclaimer
Edible Rating: 3/5
Young leaves and stems - raw or cooked[2, 105, 177]. A hot cress-like flavour, they go well as a flavouring in salads[K].

• Leaves -

Medicinal Uses*

* See disclaimer
Medicinal Rating: 0/5
None known

Propagation

Seed - sow spring in a cold frame. Germination should take place within 2 weeks. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in the summer. Make sure the pots are not allowed to dry out. Division in spring. Very easy, but protect the young divisions from slugs. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer. Cuttings succeed at almost any time in the growing season. Very easy, even a floating leaf will form adventitious roots[56].

Known Hazards

None known

Other Uses

None known

Cultivars

no recorded cultivars

References

Flora of the British Isles.
Clapham, Tootin and Warburg.
Author: Clapham, Tootin and Warburg.
Rating:
Publisher : A very comprehensive flora, the standard reference book but it has no pictures.
Date of Publication : 1962

The New RHS Dictionary of Gardening. 1992.
Huxley. A.
Author: Huxley. A.
Rating:
Publisher : Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
Date of Publication : 1992

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