Flora of Lake Isle

Typical of most Alberta lakes, Lake Isle, has a wide variety of floating, submerged and shoreline vegetation. The most common vegetation are Water Lilies, Pickerel Weed, Millfoil, Angel Hair Moss (Filamentous Algae) and Algae. Seen all around the lake are Cattails and Reeds (both close to the shoreline and also growing enmass as large beds in open water), as the seasons progress. It is the Reeds and Cattails that act as filtering agents, assisting in keeping the lake water clean by filtering out the high levels of potassium and nitrogen that accumulate in the lake due to runoff from lawn fertilizer, the neighbouring fertilized fields and also from the natural decomposition of weeds in the lake.

Blue-Green Algae (Canobacteria) Blooms are not uncommon on Lake Isle, and are predominant during the hotter spells in the summer and into the early fall. These "blooms" can be quite toxic, and Public Health warnings are issued to warn cottagers not to drink the water, use it for washing (both laundry and dishes), not to swim in areas affected, and to keep their pets out of the lake during these "blooms".

Flowering Rush - Butomus umbellatus

A species of ornamental plant that was introduced to the lake, which now is chocking out all native plants such as Cattails and Common Lake Reeds and affecting nesting water-fowl. This plant grows so thick you cannot even canoe through it. Below are some sample photos which will help you identify this highly invasive plant.

Flowering Rush can be identified by it's characteristic pink bloom, it's triangular shaped stem and by the twisting tip of the upper leaf stem. Dead or dying plant material

becomes a heavy mat and will smother all other plants in the fall.

It is imperative that every plant spotted be reported to your area rep or contact LIAMS through the "Contact Us" button.

Do not try to remove the plant, but clipping off the flowers before they go to seed helps reduce the spread of new plants. Any part of the plant removed must be burned.

Three (3) Photos of Flowering Rush provided by Alberta Agriculture and Forestry

Nicole Kimmel, Weed Specialist