The territory of the Ore Mountains belongs to the Central European Flora region characterised by a relatively humid and cold climate, as well as hungry soils formed on Palaeozoic eruptive rock. The typical vegetation of the southern slopes of the Ore Mountains features mixed and deciduous forests, especially beech woods.
Residual oak groves may be found on the warmest southern slopes, namely comprising of oak (Quercus), wild service-tree (Sorbus torminalis), white beam-tree (Sorbus aria) and linden (Tilia). The undergrowth is represented by a variety of plant species, such as mezereon (Daphne mezereum), sword-leaved helleborine (Cephalanthera longifolia), as well as a variety of other plants, a large part of which are protected plant species. A typical landscape of this character is the area surrounding Žeberk near Jezeří.
Beech forests may be found at higher elevations of the Ore Mountains. As a result of felling, however, the original forest stands were partially replaced with spruce stands and upland plains were transformed into pastures. The typical representatives of the lower layer of the beech forest are e.g. greater stitchwort (Stellaria holostea), angular Solomon's seal (Polygonatum odoratum), hair grass (Deschampsia flexuosa), reed grass (Calamagrostis arundinacea), rattlesnake root (Prenanthes purpurea), etc. Soils with higher acidity are abundant in hair grass (Deschampsia flexuosa), white wood-rush (Luzula luzuloides) or blueberry (Vaccinium myrtillus). The original beech stands may still be found in the Domaslavice Valley.
The valleys of smaller water courses in the Ore Mountains, in particular the drift soils in the lower parts of the water courses were gradually covered with communities of flood-plain forests – i.e. alder and ash woods, mainly comprising of alder (Alnus), ash (Fraxinus), maple (Acer) and elm (Ulmus) trees. The lower layers of the flood-plain forests are home to hydrophilic plants, such as marsh thistle (Cirsium palustre), cabbage thistle (Cirsium oleacerum), marsh horsetail (Equisetum palustre), white butterbur (Petasites albus), rough chervil (Chaerophyllum hirsutum), etc., and rarely also wild garlic (Allium ursinum).
Regardless of the elevation, some areas of the Ore Mountains are covered with talus forests. The occurrence of these stands is dependent on the gradient of the slope, which needs to be steep, and on the composition of the sub-soil composition, i.e. mostly rocky talus piles. These forests mainly include sycamore maple (Acer pseudoplatanus), elm (Ulmus), linden (Tilia) and ash (Fraxinus). Shrubs and bushes, e.g. hazel (Corylus), elderberry (Sambucus), perfoliate honeysuckle (Lonicera caprifolium), or currant (Ribes) are typically found in the medium layer. The lower parts of the forest are home to perennial honesty (Lunaria rediviva), dog's mercury (Mercurialis perennis), Eurasian baneberry (Actaea spicata), or European wild ginger (Asarum europaeum).
Typical for the region of the Ore Mountains are meadow phytocenoses and pastures with a large variety of grass species, e.g. meadow foxtail (Alopecurus pratensis), orchardgrass (Dactylis glomerata), quaking grass (Briza media) or wood rush (Luzula) in peak elevation areas. As to other plant species, we should at least mention European bistort (Polygonum bistorta), arnica (Arnica montana), alpine penny cress (Thlaspi alpestre), field gentian (Gentiana campestris), orchis (Orchis), etc. Rare representatives of meadow phytocenoses include spicknel (Meum athamanticum), which is frequent only in this part of the CR (rarely in the Jizera Mountains and in the Krkonoše Mountains). Due to agricultural use, most of the original meadows were changed into pastures.
The peak areas of the Ore Mountains are typical for their communities of spruce bog forests and peat bogs. Peat bogs were formed in the post-glacial period, mostly at locations where springs rose to the surface and created ponds and swamps, which were gradually overgrown with bog flora. Presently, peat moss (Sphagnum) appeared, which is a plant characterised by rapidly growing upper part while its lower part is dying-off in the water due to lack of air. In the subsequent peat-bog formation phase, bushes began to appear (e.g. heath (Calluna), black crowberry (Empetrum nigrum), blueberry (Vaccinium myrtillus), etc.), later followed by dwarf pine (Pinus mugo), which typically marks the end of turf formation. The thickness of the turf layer ranges from a few centimetres up to several metres. The peat bogs are mainly raised bogs overgrown with a scrub form of the dwarf mountain pine (Pinus x pseudopumilio) or rarely the bog birch (Betula nana). The stand is features a number of species of peat moss (Sphagnum), sedge (Carex), cotton grass (Eriophorum vaginatum), bilberry (Vaccinium), round-leaved sundew (Drosera rotundifolia) and many more, such as the rare marsh tea (Ledum palustre). Spruce bog forests grow around heath edges and, apart from spruce, we may also find European white birch (Betula pubescens) and reed grass (Calamagrostis villosa), black crowberry (Empetrum nigrum) or great willow herb (Epilobium angustifolium) in the undergrowth. The peat bogs represent the best-preserved biotype, especially thanks to their poor accessibility in terms of transport.
The most significant peat bogs are protected areas and they namely include Božidarské rašeliniště (Boží Dar Peat Bog), Malé Jeřábí jezero (Small Crane Lake) near Pernink, Novodomské rašeliniště (Nové Domy Peat Bog), as well as number of other locations.