Hydrangea
You can find folding instructions for the Hydrangea (including a number of variants) in Fujimoto’s book, Folding Origami Hydrangea (おりがみ あじさい折り).
There are also free diagrams made by John Smith available online (PDF).
If you prefer a video tutorial, you can find several on YouTube: I can recommend the one by Sara Adams.
A specific case of a dense, level-1 Hydrangea Tessellation is the Crossed Box Pleat, instructions for which you can find on Thoki Yenn’ site (also available in print).
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