Rorrippa nastutium aquaticum has lime green foliage and tiny white flowers in late Spring and competes effectively for the nutrients that blanket weed feeds on. It’s a really helpful addition, especially where blanket weed is a problem.
Top tip: When the nutrient level has dropped and blanket weed is naturally suppressed, the nasturtium will gradually die back and disappear.
Height of plant: 10-25cm
Propagation: Divide plantlets.
How to plant: Can be left free-floating, underplant with taller marginals providing there is 5cms water covering the soil in the basket, or plant into a 5lt planting basket using heavy garden loam or Westland Aquatic Soil and place on a shelf in the pond. Fill the planting basket to the brim with well compacted soil, then loosen the soil, place the plant on top and push down to secure. Do not add gravel and make sure soil is constantly just covered by water. Once the roots have grown into the soil and the plant has secured itself, the basket can be dropped down to the maximum planting depth.
Recommended planting depth: Position on the shelf so that the soil in the basket is 0-10cm below the water surface. The planting depth is always measured from soil surface to water surface, not including any gravel top dressing. Raise the basket on slabs or bricks to achieve the recommended planting depth.