As spring rises in many woodlands, the scene practices environmental awareness with new life. Be that as it may, in Hallerbos, only south of Brussels, Belgium, springtime conveys an ocean of blue to the woods floor.

Bluebells cover this antiquated woodland for a concise window of time each year — only half a month every year, normally beginning in mid-April. As the productive little bluebells assume control, guests come by the thousand to see the scene. (Maybe they’re all simply following specialist’s requests to invest more energy in nature.)

Bluebells, also known as wild hyacinth, don’t grow just anywhere. They thrive in old-growth forests, and spotting them is often a sign that the forest is ancient, even if the trees themselves are not.

Mental Floss reported that this is the case at Hallerbos. Many of the forests’ trees were cut down during World War I by the German army, but Belgium did a conservation push in the forest for 20 years to restore it. The deep-rooted bluebells survived the entire time.

The bluebells aren’t the only flowers on the forest floor here. Wood anemones and daffodils appear in the forest earlier in the spring, before the bluebells take over.

The delicate blue blooms are dependent on both cold and sunshine, so when the trees overhead begin to leaf out and create too much shade, the bluebell blooms fade. This means there’s a rare window when the bluebells are visible.

The forest isn’t far outside of Brussels, just a half hour’s drive from the city center. So if you happen to be in Brussels anyway (eating chocolate, presumably) during the latter half of April or early May, you might want to follow the pro tip in this post from Visit Brussels and head over for a morning walk:

Simply remain on the stamped ways through the woodland, and whatever you do, don’t pick them.

Can’t make it to Belgium this April? You can follow the advancement of Hallerbos’ sprouts at the open woods’ site, where the staff posts updates and bunches of photographs all through the spring season.