This example calendar shows when specific grasses are flowering (in the Netherlands). The calendar is video-based. Every grasstype is explained by a short video.
Alopecurus pratensis
Image: Alopecurus pratensis, Meadow foxtail. Five stages in ripening of the inflorescense and opening of the anthers to free pollen.
Dactylis glomerata
Poa pratensis
Anthoxanthum odoratum
Holcus lanatus
Secale cereale
Cynosurus cristatus
Lolium perenne
Arrheneatherum elatius
Poa annua
Elytrigia repens
Zea mays
Phleum pratense
Phragmites australis