Here is a list of the plants that have been recorded on Brook Meadow in the past, but which have not been found in 2020.
| NOT FOUND 2020 | Last seen | |
| Black Medick | Medicago lupulina | 2019 |
| Brooklime | Veronica beccabunga | 2019 |
| Common Ragwort | Senecio jacobaea | 2019 |
| Field Bindweed | Convolvulus arvensis | 2018 |
| Germander Speedwell | Veronica chamaedrys | 2019 |
| Honesty | Lunaria annua | 2019 |
| Ivy-leaved Speedwell | Veronica hederifolia | 2019 |
| Large Bittercress | Cardamine amara | 2019 |
| Red Dead-nettle | Lamuim purpureum | 2019 |
| Smooth Hawk’s-beard | Crepis capillaris | 2019 |
| Sweet Violet | Viola odorata | 2019 |
| Wood Speedwell | Veronica montana | 2019 |
| Slender Spike-rush | Eleocharis uniglumis | 2019 |
| LONG GONE? | Last seen | |
| American Willowherb | Epilobium ciliatum | 2005 |
| Annual Mercury | Mercurialis annua | 2013 |
| Balm | Melissa officinalis | 2016 |
| Black Nightshade | Solanum nigrum | 2010 |
| Bluebell (planted 2006) | Hyacinththoides non-scriptus | 2017 |
| Bread Wheat | Triticum aestivum | 2006 |
| Bulbous Buttercup | Ranunculus bulbosus | 2016 |
| Bush Vetch | Vicia sepium | 2001 |
| Canadian Goldenrod | Solidago canadensis | 2001 |
| Canadian Waterweed | Elodea canadensis | 2006 |
| Changing Forget-me-not | Myosotis discolor | 2018 |
| Charlock | Sinapis arvensis | 2016 |
| Chives | Papaver rhoeas | 2007 |
| Cockspur | Geranium molle | 2013 |
| Columbine (escape) | Urtica cf galeopsifolia | 2005 |
| Common Chickweed | Stellaria media | 2018 |
| Common Dog-violet | Viola riviniana | 2005 |
| Common Duckweed | Lemna minor | 2017 |
| Common Fumitory | Fumaria officinalis | 2003 |
| Common Orache | Atriplex patula | 2016 |
| Common Poppy | Foeniculum vulgare | 2003 |
| Common Reed | Phragmites australis | 2016 |
| Corncockle (planted – 2009) | Rorippa amphibia | |
| Crow Garlic (Wild Onion) | Allium vineale | |
| Dove’s-foot Cranesbill | Cannabis sativa | |
| Dutch Crocus (esc) | Crocus x stellaris | |
| Fat-hen | Chenopodium album | |
| Fen Nettle | Scrophularia nodosa | |
| Fennel | Impatiens glandulifera | |
| Field Madder | Sherardia arvensis | |
| Fool’s Parsley | Aethusa cynapium | |
| Garden Lobelia | Humulus lupulus | |
| Goat’s Beard | Tragopogon pratensis | |
| Grape Hyacinth | Muscari armeniacum | 2013 |
| Great Yellow-cress | Senecio aquaticus | |
| Green Alkanet | Persicaria lapathifolium | |
| Hairy Buttercup | Ranunculus sardous | |
| Hairy St John’s Wort | Epilobium roseum | |
| Hairy Tare | Vicia hirsuta | |
| Harebell | Campanula rotundifolia | |
| Hemp | Veronica catenata | |
| Himalayan Balsam | Leontodon hispidus | |
| Hoary Willowherb – hybrid? | Epilobium parviflorum | |
| Hollyhock (escape) | Oxalis corniculata | |
| Honesty (escape) | Vicia cracca | |
| Hop | Meconopsis cambrica | |
| Italian Lords-and-Ladies | Arum italicum ssp italicum | |
| Ivy-leaved Toadflax | Clinopodium vulgare | |
| Japanese Knotweed | Fallopia japonica | |
| Lesser Trefoil | Brassica rapa | |
| Many-seeded Goosefoot | Ribes rubrum | |
| Marsh Arrowgrass** | Triglochin palustre | |
| Marsh Horsetail | Equisetum palustre | |
| Marsh Ragwort | Echinochloa crus-galli | |
| Marsh-marigold | Caltha palustris | |
| Meadow Barley** | Hordeum secalinum | |
| Meadow Vetchling | Lathyrus pratensis | |
| Montbretia (esc) | Juncus effusus | |
| Oil-seed Rape | Triglochin maritimum | |
| Opium Poppy | Cymbalaria muralis | |
| Cuckooflower | Cardamine pratensis | |
| Curled Dock | Rumex crispus | |
| Cut-leaved Crane’s-bill | Geranium dissectum | |
| Daffodil | Narcissus ‘Dutch Master’ | |
| Daisy | Bellis perennis | |
| Dandelion | Taraxacum officinale agg | |
| Pale Persicaria | Trifolium dubium | |
| Enchanter’s-nightshade | Circaea lutetiana | |
| Pale Willowherb | Chenopoduim hybridum | |
| Feverfew | Chrysanthemum parthenium | |
| Field Bindweed | Convolvulus arvensis | |
| Petty Spurge | Euphorbia peplus | |
| Pink Oxalis (escape) | Veronica arvensis | |
| Fool’s Water-cress | Apium nodiflorum | |
| Garlic Mustard | Alliaria petiolata | |
| Germander Speedwell | Veronica chamaedrys | |
| Gipsywort | Lycopus europaeus | |
| Grape Hyacinth | Muscari armeniacum | |
| Great Burnet | Sanguisorba officinalis | |
| Great Willowherb | Epilobium hirsutum | |
| Greater Periwinkle | Vinca major | |
| Greater Plantain | Plantago major | |
| Ground Ivy | Glechoma hederacea | |
| Ground-elder | Aegopodium podagraria | |
| Groundsel | Senecio vulgaris | |
| Guernsey Fleabane | Conyza sumatrensis | |
| Pink Water Speedwell | Allium schoenoprasum | |
| Hairy Bittercress | Cardamine hirsuta | |
| Plicate Sweet-grass | Glyceria notata (plicata) | 2017 |
| Potato Vine | Aquilegia vulgaris | |
| Prickly Lettuce | Lactuca serriola | |
| Hedge Bindweed | Calystegia sepium | |
| Hedge Mustard | Sisymbrium officinale | |
| Hedge Woundwort | Stachys sylvatica | |
| Hemlock Water Dropwort | Oenanthe crocata | |
| Hemp-agrimony | Eupatorium cannabinum | |
| Herb-Robert | Geranium robertianum | |
| Hoary Ragwort** | Senecio erucifolius | |
| Procumbent Pearlwort | Sagina procumbens | |
| Hogweed | Heracleum sphondylium | |
| Honesty | Lunaria annua | |
| Purple Toadflax | Linaria purpurea | |
| Red Currant | Agrostemma githago | |
| Ivy-leaved Speedwell | Veronica hederifolia | |
| Knotgrass | Polygonum aviculare | |
| Large Bindweed | Calystegia silvatica | |
| Large Bittercress | Cardamine amara | |
| Lesser Burdock | Arctium minus | |
| Lesser Celandine | Ranunculus ficaria | |
| Lesser Stitchwort | Stellaria graminea | |
| Lesser Swine-cress | Coronopus didymus | |
| Lords and Ladies | Arum maculatum | |
| Lungwort | Pulmonaria officinalis | |
| Redshank | Persicaria maculosa | |
| Reed Sweet Grass | Glyceria maxima | |
| Marsh Woundwort | Stachys palustris | |
| Meadow Buttercup | Ranuculus acris | |
| Meadowsweet | Filipendula ulmaria | |
| Ribbed Melilot | Melilotus officinalis | |
| Michaelmas Daisy | (Aster spp) | |
| Mind your own business | Soleirolia soleirolii | |
| Mugwort | Artemisia vulgaris | |
| Nipplewort | Lapsana communis | |
| Rough Hawkbit | Cyclamen sp | |
| Pepper-saxifrage** | Silaum silaus | |
| Perennial Sow-thistle | Sonchus arvensis | |
| Perforate St John’s-wort | Hypericum perforatum | |
| Russian Comfrey | Symphytum x uplandicum | |
| Pineappleweed | Matricaria discoidea | |
| Saltmarsh Rush | Juncus gerardii | |
| Prickly Sow-Thistle | Sonchus asper | |
| Primrose (planted) | Primula vulgaris | |
| Scarlet Pimpernel | Anagallis arvensis | |
| Purple Loosestrife | Lythrum salicaria | |
| Scented Mayweed | Matricaria recutita | |
| Pyramidal Orchid | Anacamptis pyramidalis | |
| Ragged Robin | Lychnis flos-cuculi | |
| Ramsons | Allium ursinum | |
| Red Bartsia | Odontites vema | |
| Red Campion | Silene dioca | |
| Red Clover | Trifolium pratense | |
| Red Dead-nettle | Lamuim purpureum | |
| Scentless Mayweed | Tripleurospermum maritimum | |
| Sea Arrowgrass | Lobelia erinus | |
| Ribwort Plantain | Plantago lanceolata | |
| Rough Chervil | Chaerophyllum temulum | |
| Skullcap | Scutellaria galericulata | |
| Slender Speedwell | Veronica filiformis | |
| Small-flowered Crane’s-bill | Geranium pusillum | |
| Smooth Meadow-grass | Poa pratensis | |
| Smooth Tare | Vicia tetrasperma | |
| Selfheal | Prunella vulgaris | |
| Shepherd’s-purse | Capsella bursa-pastoris | |
| Silverweed | Potentilla anserina | |
| Soft Rush | Crocosmia x crocosmiiflora | |
| Spotted Medick | Medicago arabica | |
| Spreading Yellow Sorrel | Oxalis articulata | |
| Smooth Hawk’s-beard | Crepis capillaris | |
| Smooth Sow-thistle | Sonchus oleraceus | |
| Sticky Mouse-ear | Cerastium glomeratum | |
| Snowdrop | Galanthus nivalis | |
| Southern Marsh Orchid | Dactylorhiza maculata | |
| Spanish Bluebell (escape) | Hyacinthoides x massartiana | |
| Spear Thistle | Cirsium vulgare | |
| Spear-leaved Orache | Atriplex prostrata | |
| Sweet Vernal-grass | Anthoxanthum odoratum | |
| Thyme-leaved Speedwell | Veronica serpyllifolia | |
| Square-stalked St John’s-wort | Hypericum tetrapterum | |
| Tufted Hair-grass | Deschampsia cespitosa | |
| Stinking Iris | Iris foetidissima | |
| Stone Parsley** | Sison amomum | |
| Strawberry Clover** | Trifolium fragiferum | |
| Stream Water Crowfoot | Ranunculus penicillatus | |
| Summer Snowflake | Leucojum aestivum | |
| Sweet Violet | Viola odorata | |
| Teasel | Dipsacus fullonum | |
| Three-cornered Leek | Allium triquetrum | |
| Tufted Vetch | Viola ?? | |
| Water Dock | Rumex hydrolapathum | |
| Water Figwort | Scrophularia auriculata | |
| Water Forget-me-not | Myosotis scorpioides | |
| Water Mint | Mentha aquatica | |
| Water-cress | Rorippa nasturtium-aquaticum | |
| Velvet Bent | Agrostris canina | |
| Viola Pansy (Garden escape) | Alcea rosea | |
| White Clover | Trifolium repens | |
| White Dead-nettle | Lamium album | |
| Wild Angelica | Angelica sylvestris | |
| Wall Speedwell | Lunaria annua | |
| Welsh Poppy | Brassica napus | |
| White Campion | Silene latifolia | |
| Wild Basil | Papaver somniferum | |
| Wild Cherry | Prunus avium | |
| Wild Radish | Raphanus raphanistreum | |
| Wild Turnip | Solanum jasminoides | |
| Wood Sedge | Carex sylvatica |