Indian Balsam
- Peak month
- August
- Records since 2000
- 62,045
- Scientific name
- Impatiens glandulifera
Common Nettle
- Peak month
- June
- Records since 2000
- 53,331
- Scientific name
- Urtica dioica
Hawthorn
- Peak month
- May
- Records since 2000
- 44,514
- Scientific name
- Crataegus monogyna
Ribwort Plantain
- Peak month
- June
- Records since 2000
- 39,026
- Scientific name
- Plantago lanceolata
Hogweed
- Peak month
- June
- Records since 2000
- 38,903
- Scientific name
- Heracleum sphondylium
Green Alkanet
- Peak month
- May
- Records since 2000
- 37,435
- Scientific name
- Pentaglottis sempervirens
Creeping Buttercup
- Peak month
- June
- Records since 2000
- 35,825
- Scientific name
- Ranunculus repens
Creeping Thistle
- Peak month
- July
- Records since 2000
- 35,350
- Scientific name
- Cirsium arvense
Garlic Mustard
- Peak month
- April
- Records since 2000
- 35,141
- Scientific name
- Alliaria petiolata
Cleavers
- Peak month
- May
- Records since 2000
- 35,139
- Scientific name
- Galium aparine
Ash
- Peak month
- June
- Records since 2000
- 35,025
- Scientific name
- Fraxinus excelsior
Sycamore [tree]
- Peak month
- May
- Records since 2000
- 34,632
- Scientific name
- Acer pseudoplatanus
Hazel
- Peak month
- May
- Records since 2000
- 33,120
- Scientific name
- Corylus avellana
Holly
- Peak month
- April
- Records since 2000
- 32,893
- Scientific name
- Ilex aquifolium
White Clover
- Peak month
- June
- Records since 2000
- 31,709
- Scientific name
- Trifolium repens
Herb-Robert
- Peak month
- May
- Records since 2000
- 31,116
- Scientific name
- Geranium robertianum
English ivy, Common ivy, European ivy, Ivy, Needlepoint ivy, Ripple ivy
- Peak month
- April
- Records since 2000
- 30,860
- Scientific name
- Hedera helix
Japanese Knotweed
- Peak month
- June
- Records since 2000
- 30,167
- Scientific name
- Reynoutria japonica
Daisy
- Peak month
- April
- Records since 2000
- 29,849
- Scientific name
- Bellis perennis
Yorkshire-fog
- Peak month
- June
- Records since 2000
- 29,834
- Scientific name
- Holcus lanatus
Cow Parsley
- Peak month
- May
- Records since 2000
- 29,713
- Scientific name
- Anthriscus sylvestris
Blackthorn
- Peak month
- April
- Records since 2000
- 28,574
- Scientific name
- Prunus spinosa
Cock's-foot
- Peak month
- June
- Records since 2000
- 28,426
- Scientific name
- Dactylis glomerata
Elder
- Peak month
- June
- Records since 2000
- 28,375
- Scientific name
- Sambucus nigra
Red Campion
- Peak month
- May
- Records since 2000
- 28,333
- Scientific name
- Silene dioica
Selfheal
- Peak month
- July
- Records since 2000
- 28,118
- Scientific name
- Prunella vulgaris
Yarrow
- Peak month
- July
- Records since 2000
- 27,652
- Scientific name
- Achillea millefolium
Common Ragwort
- Peak month
- July
- Records since 2000
- 27,539
- Scientific name
- Jacobaea vulgaris
Meadowsweet
- Peak month
- July
- Records since 2000
- 27,430
- Scientific name
- Filipendula ulmaria
Giant Hogweed
- Peak month
- June
- Records since 2000
- 27,203
- Scientific name
- Heracleum mantegazzianum
Wood Avens
- Peak month
- May
- Records since 2000
- 26,690
- Scientific name
- Geum urbanum
Beech
- Peak month
- May
- Records since 2000
- 26,555
- Scientific name
- Fagus sylvatica
Cuckooflower
- Peak month
- May
- Records since 2000
- 25,770
- Scientific name
- Cardamine pratensis
Spear Thistle
- Peak month
- July
- Records since 2000
- 24,682
- Scientific name
- Cirsium vulgare
Ground-ivy
- Peak month
- April
- Records since 2000
- 24,139
- Scientific name
- Glechoma hederacea
Common Bird's-foot-trefoil
- Peak month
- June
- Records since 2000
- 24,100
- Scientific name
- Lotus corniculatus
Pedunculate Oak
- Peak month
- August
- Records since 2000
- 24,087
- Scientific name
- Quercus robur
Great Willowherb
- Peak month
- July
- Records since 2000
- 24,020
- Scientific name
- Epilobium hirsutum
Heather
- Peak month
- August
- Records since 2000
- 23,828
- Scientific name
- Calluna vulgaris
Red Clover
- Peak month
- June
- Records since 2000
- 23,504
- Scientific name
- Trifolium pratense
Greater Plantain
- Peak month
- July
- Records since 2000
- 23,502
- Scientific name
- Plantago major
Broad-leaved Dock
- Peak month
- May
- Records since 2000
- 22,935
- Scientific name
- Rumex obtusifolius
Rowan
- Peak month
- August
- Records since 2000
- 21,307
- Scientific name
- Sorbus aucuparia
Germander Speedwell
- Peak month
- May
- Records since 2000
- 21,208
- Scientific name
- Veronica chamaedrys
Lesser Celandine
- Peak month
- April
- Records since 2000
- 21,114
- Scientific name
- Ficaria verna
Meadow Buttercup
- Peak month
- June
- Records since 2000
- 20,980
- Scientific name
- Ranunculus acris
Tormentil
- Peak month
- June
- Records since 2000
- 20,922
- Scientific name
- Potentilla erecta
Garden Sorrel
- Peak month
- June
- Records since 2000
- 20,829
- Scientific name
- Rumex acetosa