Hydrangea out, periwinkle or snake herb in: this is how you make your garden heat-resistant

And logically, because these Dutch garden classics are not at all made for above-average sunny and dry summers. Take the hydrangea. “It originally comes from the rainforest of Asia, from the shadows”, says Frans van Oostveen, plant specialist at the Utrecht garden center Steck. “That plant is not completely adapted to this weather and has no deep roots, so it can’t reach the water.”