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Small Balsam Impatiens parviflora habit drawing of a clump of plants

Persian Hogweed Heracleum persicum in flower showing habit and growth form

Milkweed Asclepias syriaca habit drawing showing two plants in flower

Lupin Lupinus polyphyllus habit drawing showing palmate leaves and flower spikes

Japanese knotweed Fallopia japonica habit drawing showing thicket of the plant

Japanese Hop Humulus japonica habit drawing showing how the plant climbs and spreads

Himalayan balsam Impatiens glandulifera habit drawing showing entire plant

Canadian Goldenrod Solidago canadensis habit drawing showing entire plant

Japanese rose Rosa rugosa habit showing mature bush in flower

Japanese knotweed Fallopia japonica and Himalayan balsam Impatiens grandiflora seedling comparison

Japanese knotweed Fallopia japonica seedling showing rounded leaves and pink stem

Japanese Rose Rosa rugosa sketchbook study page and habit sketch

Japanese Rose Rosa rugosa graphite leaflet showing shiny leaflets and dentition on margin

Rosehip cross section sketchbook study showing seeds and remnants of sepals

Skunk Cabbage Lysichiton americanus sketchbook study page showing detail of flower and plant

Skunk Cabbage habit drawing showing a clump of plants with distinctive yellow spathes

Skunk Cabbage Lysichiton maericanus graphite drawing leaf with person to show scale

Tree of Heaven Allanthus alitissima  comparing bark of mature tree (on left) with young tree (on right)

Tree of Heaven AIlanthus alitissima bark of old tree showing grey colour and deep fissures

Tree of Heaven AIlanthus alitissima bark of young tree showing heart shaped leaf scar

Giant Hogweed Heracleum mantegazzianum habit drawing

Japanese Hop Humulus japonicus sketchbook study page.  Showing hops, seedling, stems detail, comparisons with the European common Hop, and male and female flowers

Persian Hogweed Heracleum persicum sketchbook study showing rounded curve of flowering head, and convex toothed leaf lobes.