
SLIPPER MILL POND PRESERVATION ASSOCIATION - SMPPA
Managed by Volunteers for the Benefit of the Community & Wildlife
Wildlife - Plants
Over 160 plant types have been recorded immediately adjacent to the pond. The list below was updated in 2020-21, the first time since the 2005 Plant Register (a log of plants and flowers at that time). It forms part of the schedules for Biodiversity monitoring.
The plants are not actively controlled other than the Common Reed (Phragmites Australis). Although this is a structural and attractive plant, it is also designated by the RHS as "invasive". The Sea Club Rush (Scirpus Maritimus) is similar looking but is not as tall and does not spread in the same manner. More details and background can be found below.
In line with our planting plan we have removed many non-indigenous "garden" type plants and are gradually planting native species in their place.

Native Plants - East Bank
Achillea millefolium - Yarrow
Alliaria petiolate - Garlic, Mustard
Artemisia vulgaris - Mugwort
Arum maculatum - Lords & Ladies
Atriplex portulacoides - Orache, grass leaved
Ballota nigra - Horehound, Black
Calamitha sylvatica - Calamint Common
Capsella bursa-pastoris - Shepherd's Purse
Cardamine hirsute - Bitter cress, Hairy
Cardamine pratensis - Cuckoo flower
Chelidonium majus - Celandine, greater
Cirsium arvense - Thistle, Creeping
Cirisium vulgare - Thistle, spear
Conium maculatum - Hemlock
Coronopussquamatus - Swinecress
Crataegnus monogyna - Hawthorn tree
Crithmummaritimum - Samphire, rock
Digitalis - Foxglove
Dipsacusfullonum - Teazle
Epilobium angustifolium - Willow Herb, Great
Epilobium hirsutum - Willow Herb, Rosebay
Euphorbia peplus - Spurge
Geumurbanum - Avens, wood
Hypochaerisradicata -Catsear
Lactucaserriola – Lettuce, Prickly
Lapsana communis - Nipplewort
Lamium album - Dead nettle, white
Lamium purpureum - Dead nettle, red
Lapsana communis - Nipplewort
Leonodon saxatilis - Hawkbit, Lesser
Limbardacrithmoides - Samphire, golden
Linaria pupurea - Toadflax, Purple
Linaria pupurea - Valerian
Lycopus europaeus - Gypsywort
Linaria pupurea - Valerian
Marticaria perforate - Mayweed, scentless
Medicago arabica - Medick, spotted
Medicago lupina - Medick, black
Mercurialis annua - Mercury, annual
Nepeta cataria - Catmint
Oenanthe crocata - Hemlock, Water
Papaver rhoeas - Poppy, red
Parietaria Judaica - Pellitory-of-the-wall
Pieruisechoides - Bristly Oxtongue
Plantago major - Plantain, greater
Plantago lanceolata - Plantain, ribwort
Polygonum aviculare - Knotgrass
Potentilla reptans - Cinquefoil Creeping
Pulicariadysenterica - Fleabane, common
Ranunculusficaria - Celandine, lesser
Ranunculus repens - Daisy
Rumex acetosa - Sorrel
Rumex conglomeratus - Dock, clustered
Rumex crispus - Dock, curly
Rumex obtusifolius - Dock, broadleaved
Rubus fruticus - Bramble
Senecio jacobaea - Ragwort
Silene vulgaris - Campion, Bladder
Sison amomum - Parsley, Stone
Sisymbrium officinale - Mustard, hedge
Sonchus arvensis - Sow Thistle
Sonchus oleraceus - Sow Thistle, Smooth
Stachis sylvatica - Woundwort Hedge
Symphytum uplandicum- Comfrey Russian
Taraxacum officinale - Dandelion
Tragopogan pratensis - Meadow salsify
Tripoliumpannonicum - Sea Aster
Ulex europaeus - Gorse
Urtica dioica - Stinging Nettle - Urtica dioica
Urtica diociasubspgaleopsifolia - Stinging Nettle, Fen non-stinging
Veronica chamaedrys - Speedwell
Veronica anagallis aquatica - Speedwell, water
Veronica persica - Speedwell, Common/field
Native Plants - West Bank
Agrostis capillaris - Bentgrass, common
Beta vulgaris - Beet, red
Beta vulgaris - Sea Beet
Cirsium arvense - Thistle, Creeping
Cirisium vulgare - Thistle, spear
Dipsacusfullonum - Teazle
Halimoneportulacoides - Sea Purslane
Pulicariadysenterica - Fleabane, common
Rumex acetosa - Sorrel
Spergularia marina - Sea Spurrey, lesser
Native Plants - South Bank
Rubus fruticus–Bramble
Urtica dioica - Stinging Nettle invasive keep reduced S/E
Urtica diociasubspgaleopsifolia - Stinging Nettle, Fen non-stinging
Phragmites australis - Common Reed managed
Grasses - East Bank
Agropyron repens - Couch
Agrostis capillaris- Bentgrass, common
Agrostis stolonifera - Creeping Bent
Arrhenatherum elatus - False Oat
Bromus hordeaceus - Brome, Soft
Bromus sterilis- Brome, Barren
Dactylis glomerata - Cock’s-foot
Deschampsiacespitosa - Tufted Hair Grass
Festuca rubra - Red fescue
Hippophaepleamnoides - Sea Buckthorn
Holcus Lanatus - Yorkshire Fog
Lolium perenne - Rye Grass perennial
Phleum Pratense - Timothy
Phragmites australis - Common Reed
Salix babylonica - Willow Weeping
Scirpus maritimus - Sea Club-rush
Grasses - West Bank
Agropyron repens - Couch
Agrostis stolonifera - Creeping Bent
Arrhenatherum elatus - False Oat
Bromus hordeaceus - Brome, Soft
Bromus sterilis- Brome, Barren
Dactylis glomerata - Cock’s-foot
Festuca rubra - Red fescue
Lolium perenne- Rye Grass perennial
Phragmites australis - Common Reed
Pond Plants
Fucus vesiculosus - Bladder Wrack - seaweed
Ulva lactuca - Sea Lettuce

Non-Native Plants - East Bank
Acer campestre - Field Maple hedge
Aegopodium podograria - Ground elder invasive
Aliumvineale -Garlic, Crow garden plant
Anagallis arvensis - Scarlet Pimpernel invasive
Aster amellus - Michaelmas Daisy garden plant
Buddleia davidii - Buddleia (under review)
Calistegiasepium - Bindweed, Hedge invasive
Calystegia sylvatica - Bindweed, Great invasive
Carex pendula - Pendulous Sedge garden plant
Convolvulus arvensis - Bindweed, field invasive
Eleagnus angustifolia - Russian Olive base visible roots
Endymion hispanicus- Bluebell, Spanish
Euphorbia portlandica - Spurge, Portland garden plant
Galium aparine - Cleaver invasive
Geranium dissectum - Cranesbill, cut-leaved invasive
Hedera helix - Ivy
Helianthus x laetifolia - Sunflower, perennial garden plant
Helminthotheca echioides - bristly oxtongue
Hordeum murimum - Barley, wall
Ilex aquifolium - Holly
Lonicera pileate - Box honeysuckle
Malva sylvestris - Mallow, common
Muscarineglectum - Grape Hyacinth spring/summer
Narcissus pseudonarcissus - Daffodils if not native (plain yellow single trumpet)
Phormium tenax - New Zealand flax
Polygonum maculosa - Redshank garden plant
Potentilla anserina - Silverweed garden plant
Rubus idaea - Raspberry
Stellaria mediq- Chickweed common invasive
Tanacetum parthenium - Feverfew garden plant
Verbascum Thapsus - Mullein garden plant
Viburnum tinus - Viburnum base and root to be removed
Vinca minor - Periwinkle garden plant
Wheat
"Invasive" Plants to be maintained
Ranunculus repens - Buttercup, creeping
Ranunculus acris - Buttercup, meadow
Daucus carota - Carrot, Wild remove dead stem
Anthriscus sylvestris - Cow Parsley remove dead stems
Senecio vulgaris - Groundsel
Urtica dioica - Stinging Nettle
Urtica diocia subsp galeopsifolia - Stinging Nettle, Fen non-stinging
Small areas of Common Reeds (Phragmites Australis) or "reeds" were deliberately planted in the 1980s and 1990s, and have been spreading along the pond bank of Slipper Road ever since; particularly in the less saline area at the northern end where they have grown very strongly and have also been spreading into the Pond. Over many years, much time and effort has been taken by the Trustees and Volunteers to try to "contain" the spread of the reeds using various measures including matting placed over cut reeds, poisoning by hand of individual reed stems, and cutting them back to try to "drown" them. These measures have been extremely time-consuming and not effective, except in the very short term, and in recent years the expansion has been around 0.5m a year and more than this in some places; if left untouched, they will completely cover the bank of Slipper Road.
Following detailed investigation by the Reeds Subgroup and various meetings with outside specialists, it has become clear that the only two long-term options for removal are; excavation - which could potentially cause damage to the banks, and therefore to Slipper Road; or engage a specialist contractor using a licensed herbicide approved by the Environment Agency (the preferred option) - a method which is often used in many locations elsewhere. In March 2025 it was agreed to try to significantly reduce the size of the Phragmites reed beds in the north-east corner and in the middle section of Slipper Road, the areas of most concern and which generate the greatest amount of maintenance work. The southern section of reeds is to be left untouched unless the reeds start encroaching onto Slipper Road or are seen to be taking over the Pond. The Trustees have agreed therefore to cut back the reeds in the two proposed sections, to prepare for this work to take place.
We have been reassured that the herbicide used will have no impact on humans, fish or wildlife. It will be applied by a licensed operator and, importantly, the solution is made up of 99% water. This means that any small dilute contamination of the pond that may occur as part of the process is likely to be less significant than the regular sewage damage that the local seawater, and therefore the pond, has to put up with.
We appreciate that some members are concerned about the cutback, and we would like to reiterate that the decision to reduce the size of the two reed beds has not been taken lightly. The reed cutting has been carried out before the Reed Warblers arrive (normally in late April/early May) and start nesting, and there is plenty of reed habitat for them in many other places in the local area (Peter Pond, Thorney etc). The aim is very much not to lose all of the reeds as it is a valuable aspect of the Pond's vegetation, and it assists with purifying the water and bank stability. However, the reduction of the area it covers is important to support other wildlife, time spent on management of the reeds and allowing walkers along Slipper Road greater visibility of the pond. The intention is ultimately to replace the reeds with Sea Club Rush to protect the banks, and other wildlife planting in the cleared areas.