With repetitive mowing of the orchard, common grasses came to dominate the sward, but other species spontaneously appeared and still others suitable to the habitat or found growing nearby were introduced in the form of seed by myself.
Amongst those species which seemed to appear from nowhere or migrated from the hedges, or reappeared from the seed bank in the soil, were:
Common mouse-ear Cerastium fontanum
Common St Johns wort Hypericum perfoliatum (seems to have spread out from the hedges)
Creeping cinquefoil Potentilla reptans
Spotted medick Medicago arabica
White clover and red clover Trifolium repens and T. pratense
Cow parsley Anthriscus sylvestris
Hogweed Heracleum sphondylium
Rough chervil Chaerophyllum temulentum
Hedge parsley Torilis japonica
Lesser stitchwort Stellaria graminea
Common cat’s-ear Hypochoeris radicata
Dandelion Taraxacum officinale
Yarrow Achillea millefolium
Common ragwort Senecio jacobaea (and later Hoary ragwort S. erucifolius)
Common forget-me-not Myosotis arvensis
Corn mint Mentha arvensis
Ground ivy Glechoma hederacea
Lesser bindweed Convolvulus arvensis (also as a persistent weed in the vegetable beds)
Common figwort Scrophularia nodosa
Self-heal Prunella vulgaris
Germander speedwell Veronica chamaedrys (a few patches of)
White dead-nettle Lamium album
Cowslip Primula veris (a later arrival - a slowly expanding clump at the very top of the orchard)
Common vetch Vicia sativa
Stinging nettle Urtica dioica (grows in patches or spreads out from hedges)
Hedge woundwort Stachys sylvatica (similar growth pattern to stinging nettle)
Dog’s mercury Mercurialis perennis (grows in hedge bottoms in the locality)
Spear thistle Cirsium vulgare
Creeping thistle Cirsium arvensis (also as a persistent weed in the vegetable beds)
Lesser celandine Ranunculus ficaria (particularly at the top of the orchard and on the margins of the pond)
Grasses, rushes and sedges:
Glaucous sedge Carex flacca? (one or two large patches)
False fox sedge Carex otrubae
Hard rush and soft rush Juncus influxus and J. effusus
Yorkshire fog Holcus lanatus
False oat grass Arrhenatherum elatius (a tall grass which was very prevalent in the early years)
Cocksfoot Dactylis glomerata
Soft brome Bromus mollis
Creeping bent Agrostis stolonifera
Tufted hair-grass Deschampsia caespitosa (after a few years two tufts of this tall grass appeared)
Several other common grass species
Lastly, around the latter noughties a pyramidal orchid Anacamptis pyramidalis appeared, in later years to be joined by several others, growing among the fruit tree rows, a few rows in from the western edge. One year these were supplemented by a single bee orchid Ophrys apifera.
Other species which I knowingly introduced in the form of collected seed from nearby local sources, such as roadside verges, or with ‘green hay’ from my former allotment in the village:
Meadow buttercup Ranunculus acris
Fleabane Pulicaria dysenterica (forms large patches in the damper parts of the orchard)
Common knapweed Centaurea nigra
Common sorrel Rumex acetosa
Tufted vetch Vicia cracca
Stone parsley Sison amomum (has done perhaps too well)
Grasses and sedges:
Sweet vernal grass Anthoxanthum odoratum
There are a few species growing around the pond margins, including:
Yellow flag iris Iris pseudacorus
Celery-leaved buttercup Ranunculus sceleratus
Great willow-herb Epilobium hirsutum
Bittersweet (woody nightshade) Solanum dulcamara