The coloured sap stains turn from yellow to orange to crimson. Only in the yellow phase is nectar produced, which contains up to 70% sugar.
Flowers of the Horse Chestnut
... the woad is an old dyeing plant? The yellow woof, a reseda plant, was also used for dyeing. "Wau" is an old term for dyeing.
Woad
... the bumblebees you see in early spring are all queens. They first have to build a nest and lay eggs and thus establish a state.
Bumblebees
... the pasque flower blooms very early in the year? That it is an anemone plant and is highly poisonous due to the alkaloid protoanemonin, especially for dogs?
Pasque flower
... there are different rennet herbs in the Kaiserstuhl? In the past, the yellow flowering true rennet was used to thicken milk, as the plant juice contains 1% rennet enzyme.
Rennet herbs
... all the orchids that grow here are terrestrial orchids? The orchids on the windowsill are originally from the tropics and epiphytes that perch on trees.
Orchids
... Butterflies that overwinter with us as moths, like the lemon butterfly, have frost protection in their bodies that prevents them from freezing to death?
Butterflies
... the white tower snail is called the "Kaiserstühl barometer"? It crawls up the stalks in fine weather to escape the heat of the ground, otherwise the snails dry out.
Tower snail
... the Roman snail eats the clutches of the red slug?
