Some phenology data

The flowering seasons of blackthorn and whitethorn based on my observations from 2020 onwards (red - flowering; blue not flowering).

Prunus cerasifera

Prunus spinosa

Crataegus laevigata

Crataegus x media

Crataegus monogyna

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I know phenology is the timing of plant life-cycle events, such as flowering or leaf opening, etc. But that is not enough for me to understand your data. Can you give me a clue?

The horizontal axis is day of year (skipping 29th February). The vertical axis is records for each day, scaled to the maximum number of records for a date. The narrower vertical lines divide the year up into months.

PS: Discourse has shrunk the images - “open image in new tab” to see the full size images.

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Excellent, thanks, and opportune following Roger Clew’s comment today in my Blackthorn post!