The vegetation in Thijsse’s Hof
In Thijsse’s Hof the most important vegetation types of the calcareous dunes in South Kennemerland are presented. They are indicated on the map.
B - Dune woodland (duinbos)
In the dune woodland common oak is dominating. Other trees and shrubs are beech, sycamore, bird-cherry, hawthorn, hazel and yew. The herb layer is rich in species and practically throughout the year one can see plants blooming. Snowdrop and spring snowflake flower in winter and early spring. About April and May most species are flowering: wood anemone, bird-in-a-bush, primrose, bluebell, leopard’s-bane and ramsons. The woodland is rich in bird species such as chaffinch, chiffchaff, blackbird, song thrush and various tit species.
H - Dune scrub and coppice (duinstruweel en hakhout)
Scrub is a vegetation where shrubs dominate. Spindle-tree, hawthorn, sea-buckthorn, buckthorn and barberry are characteristic species of the dunescrub on calcareous soil. In autumn many shrubs have berries that attract birds. Coppice is a low woodland where trees are cut down regularly before they are tall. The coppice is rich in shrubs.
Gd - Dry dune grassland (droog duingrasland)
‘Dry’ means that this grassland is independent of the influence of the ground water. This in contrast with the dune slack vegetation that needs this influence. In May and June the grassland is the most beautiful with flowering field scabious, common knapweed, germander speedwell, oxeye daisy, maiden pink and salad burnet. Striking grasses are quaking-grass, downy oat-grass and false oat-grass.
Gr - Slope with burnet rose (duinrooshelling)
The vegetation of this slope is dry dune grassland with much burnet rose and common rock-rose. Some other rare species are yarrow broomrape and pyramidal orchid.
Gs - Grassland poor in nutrients with heather (schraal grasland met heide)
In the past the topsoil has been removed and replaced by sods with heather. So the soil became more acid and poorer in nutrients. It came out that the habitat for heathland was not optimal and most of the heather has disappeared. Still some heather is growing here together with some other acidophilous species as broom, gorse, common juniper and the herbs wavy hair-grass, brown bent and hawkweeds.
D - Dune (duin)
For the creation of the dune in 1989, calcareous dune sand has been brought down from the adjacent dune area. A dry dune grassland has established, a suitable habitat for pyramid orchis and crested hair-grass.
V- Pond (vijver)
The pond is an important part of Thijsse’s Hof, as well concerning the garden architecture as the ecological value. The pond attracts many bird species and is an important habitat for dragon-flies. In the water grow spiked water-milfoil, mare’s-tail and fringed water-lily.
S - Demonstration border (demonstratiestrook)
In the demonstration border wild plants are cultivated, especially species that have no natural habitat in Thijsse’s Hof. Also medicinal and tinctorial plants are growing there.
M - Vegetation of dune slacks (moeras en duinvalleivegetatie)
The dune slack is situated between the pond and the dry dune grassland. This vegetation is bound to the vicinity of the ground water. Here, you can see southern marsh-orchid, meadowsweet, yellow loosestrife, slender tufted-sedge and many other marsh plants. Greater yellow-rattle grows as well in the dune slack as in the dry dune grassland. In April fritillary and summer snowflake are flowering.
A – Weed field (onkruidakker)
The weed field reminds us of the period before herbicides came into use and poppy, cornflower, cornockle and large Venus’s-looking glass embellished our corn fields.
Between the field and the instruction building there is a small demonstration pond with adjacent marsh and walls with wall vegetation.
L - Instruction building
P - Eating house