How to Control Blanketweed

How To Control Blanketweed

Now the days are getting longer, and the pond water is starting to warm up, life in the pond is starting to begin plants growing fish starting to feed, and insects and tadpoles appearing in the pond.

But that can mean the start of the dreaded blanketweed.


With the best efforts of the pond keeper most pond will be affected with blanketweed at some point, Blanketweed can grow in the cleanest of ponds.


So why does blanketweed reappear in spring

·        Days become longer

·        Water temps start to rise

·        More sun light

·        Pond plants have not yet begun to grow

All these combinations allow the growth of blanketweed starting on the sides of the pond, rocks and plant stems which act as an anchor for the algae to grow.


If left unattended blanket weed can cause some several issues in a pond

·        Blocking pumps and filters

·        Sturgeon and Sterlets may become tangled in it

·        Through the night blanket weed consumes valuable oxygen which can lead to very low oxygen levels in summer.

So, it is important to get on top of blanket weed as soon as it starts to appear.


How to remove blanketweed safely

Start tackling blanketweed by removing as much as possible by hand from the pond using a stick, net or blanketweed brush, but don’t depose of it straight away leave it at the side of the pond for any insects and invertebrates to return to the pond after a few days dispose of the algae.

Once you have removed the bulk of the blanketweed you can treat the pond to help prevent it from returning.

·        Blanketweed treatments

·        Barley straw (for a natural approach)

As the treatment takes effect, you will need to remove any dead organic matter and add a sludge remover to help with the cleaning prosses. Some ponds that are well planted will only need one treatment, whereas others will need regular maintenance throughout the year.




Preventing Blanketweed

There are a few steps that can be taken to help reduce the growth of blanketweed in the pond.

·        Adding more aquatic plants to compete for nutrients and cover the pond surface blocking light.

·        Clean filters regular using pond water don’t use tap water.

·        Avoid over stocking with fish.

·        Remove silt from the bottom of the pond

·        Don’t over feed fish to reduce waste

So, with spring well on the way now is the time to act on blanketweed for healthier cleaner pond to keep your fish happy and you can enjoy your pond with out the nuisance that is BLANKETWEED.

by paul 3 June 2026
•  Continue planting up pots, baskets & borders with bedding plants water regularly to help them establish. • Tie in new stems of climbing and rambling roses to supports. • Pinch outshoots on fuchsias to encourage bushier growth. • Start feeding containers and baskets with a liquid feed every few weeks. • Start to pick sweet pea flowers as this will encourage more flowers. • Use soft ties to tie in new clematis shoots. • Stake perennials like hollyhocks & Delphiniums to prevent damage in the wind. • Dead head repeat flowering roses. • Give wisteria its summer prune cutting all the long side shoots back to 20cm, to promote flowering for next spring. • Dot a few French marigolds around tomato plants - these strongly scented flowers will help deter insect pests. • Keep the surface of ponds clean by removing floating weeds. Use a net to scoop out mats of tiny-leaved duck weed and twirl hair-like blanket weed from the surface with a stick or garden cane – before putting on the compost heap, leave on the edge of the pond overnight so any aquatic creatures can crawl back into the water.
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