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These are a group of soft stemmed fast growing plants which live beneath the surface of the pond, mostly rooting into the bottom. Like all plants, they give off oxygen as a by-product of photosynthesis, but because they are submerged this oxygen dissolves into the water, helping to keep the water sweet for invertebrate and vertebrate animals and discouraging the growth of single celled algae (the source of green water) and string algae (blanket weed). Essential in any pond. I mainly stock native oxygenators; imported varieties have often become a pest in the wild. Some non-natives such as Lagarosiphon major and Elodea canadensis have already become widely naturalised. All but Ceratophyllum, which doesn't make roots, will benefit from being planted up in baskets, where they can root and spread. Use 2 to 5 bunches in a 2 or 3 litre basket.

Many types of oxygenator become very brittle in summer and cannot be handled then; purchase your requirements early in the season for best results. Bunches are of 8-10 strands minimum.
Callitriche Stagnalis
a pretty and delicate plant which does best in cooler water conditions. Not available in summer.
• Depth 0.80cm

3 for £5.00
Ceratophyllum demersum (Hornwort)
this plant doesn’t root into the bottom and simply grows loose near the bottom of the pond and among other plants. Ideal for smaller ponds as it doesn’t become invasive. Usually available from April to September.
• Depth 10-300cm
Eleocharis acicularis (Dwarf hairgrass)
A slow growing grass-like plant, ideal for a small pond.
• Depth 0-30cm
Elodea canadensis (Canadian pond weed)
Once the staple plant sold everywhere it was replaced by Lagarosiphon, which is bushier, greener and (slightly) less invasive, but still not native. This has now been banned from sale, but bizarrely the original Canadian pond weed is still legal to sell. I don't like this one and don't recommend it but if you can give me a good reason why you want it then I can send it at £1.50 per bunch. I recommend using a native oxygenator.

Fontinalis antipyretica (Willow moss)
another plant which prefers cooler water conditions, with fine multi-branched stems. Will grow to a significant depth in clear water but is easily swamped by blanket weed in rich water. Only available in Spring.

Hippuris vulgaris (Marestail)
no, not that one! Looks very similar to M verticillatum but won't grow in deep water. Good for invertebrates in shallow areas .
• Depth 0-15cm
Lagarosiphon major (formerly Elodea crispa)
The sale of this plant will be banned from end July 2017 within the EU due to its tendency to spread aggressively in the wild.
• Depth 30-300cm
Myriophyllum crispatum
This is not native but is a good substitute for M verticillatum when the latter is not available. For garden ponds only, not natural ponds.
• Depth 0-20cm
Myriophyllum spicatum (spiked water milfoil)
a fast growing type with soft leaf filaments, ideal for spawning fish and newtswith leaflets arranged like fishbones arranged around a central rib.

• Depth 30-400cm
Myriophyllum verticillatum (whorled milfoil)
similar to the above but the top may protrude a centimetre or two above the water surface. Often confused with Parrots Feather (M. aquaticum) – a banned invasive foreign species. Only available occasionally, please enquire.
• Depth 30-100cm
Potamogeton crispus (curled pond weed)
attractive bronzy ruffled leaves on branched stems make this a very attractive plant. This one roots strongly and sometimes needs control in larger ponds. Brittle in summer so can’t be posted then; buy when water is cooler.
• Depth 20-100cm
Potamogeton natans (broad leaved pondweed)
not strictly an oxygenator as the oval leaves float on the surface, but will grow at much greater depths-up to 3 metres - where almost nothing else will grow.
• Depth 30-300cm
Ranunculus aquatilis (water crowfoot)
a very variable plant, which has long branched stems rooted at the bottom. Can form large stands where it is happy, but does prefer clean moving water. Has the benefit of small white flowers with yellow centres in summer.
• Depth 0-150cm
Ranunculus hederaceus (ivy leaved crowfoot)
as its name suggests, its leaves are a similar shape to ivy but it grows in the same way as river crowfoot above. Will grow up to 60cm deep but prefers just a few centimetres of water or just the wet soil at the waters edge. Supplied loose, not bunched.
• Depth 0-30cm
Scirpus cernuus (fibre optic plant)
slow growing bright green grass-like plant with tiny flowers on the tips like cotton buds. Ideal for a small pond or shallow water.
• Depth 0-10cm
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