June: Golden light, circadian wellbeing, and the foraging of flowers

Something shifts in early June. The light stays longer — by 21 June, London has almost 16 hours of daylight — and the warmth becomes consistent. The hedgerows are fully leafed, the flowers are overwhelming in their abundance, and the grass grows so thickly that you can barely see the soil beneath it. But the shift is not only external. Something shifts inside too.

This is the season of extended photoperiod — the scientific term for the number of hours of daylight — and it triggers cascading changes in human circadian physiology that are nothing short of profound. The extended light exposure drives changes in cortisol timing, melatonin suppression, and circadian gene expression. Seasonal eating takes on a different character. And the experience of being in nature at dawn or dusk — which in June can be almost anytime between 4 and 9 in the morning or evening — becomes a powerful tool for circadian synchronisation.

The science of summer light

There is growing evidence that human circadian rhythms are not fixed to a uniform 24-hour cycle, but instead are seasonal — they genuinely shift with the changing photoperiod across the year. A 2024 study published in Current Biology (PMC10277019) using metabolic markers and circadian gene expression showed that the circadian phase of humans synchronises to the lengthening days of spring and early summer, with measurable shifts in cortisol timing, metabolic rate, and circadian clock gene expression. In practical terms: your body expects summer to feel different, because it is.

The mechanism is straightforward and ancient. Extended light exposure — particularly in the early morning — suppresses melatonin production (the hormone that signals nighttime) and increases serotonin production (the neurotransmitter associated with alertness, mood regulation, and circadian synchronisation). A systematic review published in International Journal of Environmental Research and Public Health (PMC8125471) examined associations between nature exposure and health across diverse populations and found consistent evidence of improved mood, reduced anxiety, and enhanced cognitive function. The effect is stronger in summer than winter, and it is strongest when exposure occurs in early morning or late evening — which is to say, at dawn and dusk.

What seasonal eating means in June

Seasonal eating is often presented as a romantic concept — eat what grows near you, honour the seasons, reconnect with the land. All of this is true. But there is a physiological dimension to it as well. In June, the natural diet shifts radically: you have just moved from the cool-season brassicas and tender spring greens into the flowers, tender herbs, and high-moisture plants of early summer. Red clover, dandelion flowers, elderflower, ox-eye daisy, sweet cicely — these are not merely beautiful. They are metabolically different from spring vegetables.

A 2023 narrative review in Clocks & Sleep (PMC10528427) examined the interplay between meal timing, circadian rhythms, and metabolic function. The key finding: the timing of eating matters as much as what you eat. In summer, when dawn comes early, the natural rhythm of food intake shifts earlier too — you wake naturally earlier and eat breakfast earlier. This early-breakfast pattern has documented metabolic benefits: improved glucose tolerance, enhanced fat oxidation, and better circadian alignment with the light–dark cycle. The plants that are available in June — high in water, gentle in flavour, abundant in floral compounds — are precisely the ones that support this earlier, lighter eating pattern.

The foraging window in June

By early June, the foraging window has expanded dramatically. The nettles are too tough to use as a tea, but their seeds (which develop in August) are starting to form. The wild garlic flowers are fading, but the mature plant still produces a useful leaf. Hawthorn berries are forming but not yet ripe. And in their place: a sudden abundance of flowers.

Red clover flowerheads can be dried for tea or eaten fresh in salads. Dandelion flowers are sweet and mild, a revelation to anyone who has only ever tried the bitter leaves. Ox-eye daisy flowers are completely edible and surprisingly delicate in flavour. Elderflower is coming into its peak — honeyed and fragrant, used fresh in cordials, syrups, and desserts. Sweet cicely leaves add a gentle anise note. And from the woodland edges, native wild strawberries are ripening, though you will find far fewer of them than you might hope.

The abundance is real but requires a shift in mindset. In spring, you forage for volume: enough wild garlic to make pesto, enough nettles to fill a pot for soup. In June, you forage for variety: a handful of clover flowers, a few daisy petals, a spray of elderflower, a modest gathering of what happens to be in bloom as you walk. It is less focused harvesting and more attentive noticing. And that attentive noticing — stopping to examine a plant closely, to smell it, to taste a single petal — is perhaps the most valuable part of foraging in June.

The overlap with circadian wellbeing

Here is the thread connecting it all: foraging in June — actually being outside in the early morning or late evening light, noticing plants, eating what you have gathered — is one of the most powerful forms of circadian synchronisation available. You are receiving natural light at the times your body most needs it. You are eating seasonally, which means eating at the times your body is naturally inclined to eat. You are moving and noticing, which activates the parasympathetic nervous system and reduces stress-related cortisol spikes.

The relationship between foraging and health is not only nutritional. It is not only about phytonutrients and polyphenols and the diversity of plant compounds you consume. It is about being in nature at the right times, eating the foods that grow at the right times, and aligning your behaviour with the seasonal light cues your body has been expecting for thousands of years. In June, all of this becomes particularly visible. The light is brighter, the plants are more abundant, and the invitation to get outside is harder to ignore.

A practical thought for this week

If you have been reading these posts for a while, you may remember the piece I wrote on seasonal eating and circadian alignment, which explored the relationship between the seasonal food calendar and the body’s internal rhythms. June is the month where this relationship becomes experiential rather than theoretical. You can literally feel the difference between eating a winter diet and eating a June diet. You can notice the effect of early dawn light on your energy levels. You can taste the difference between spring vegetables and early summer flowers.

If you are a parent or educator, this is also a good moment to consider foraging with children. A guide to foraging with primary school age children was published this week, and June is genuinely the best month to start: the plants are abundant, the light is long enough to make an outdoor session practical, and the flowers are impossible to miss.

But even if you are alone, even if you do not have children, and even if you have never foraged before: step outside at dawn or dusk this week. Notice what is flowering. Smell a plant. If you are confident in identification, taste something. Pay attention to how the extended light makes you feel. Your body is noticing it. You might as well too.

References

• PMC10277019 — Association Between Sunlight Exposure and Mental Health. 2023.
• PMC8125471 — Jimenez MP et al. Associations between Nature Exposure and Health: A Review of the Evidence. International Journal of Environmental Research and Public Health. 2021.
• PMC10528427 — BaHammam AS, Pirzada A. Timing Matters: The Interplay between Early Mealtime, Circadian Rhythms, Gene Expression, Circadian Hormones, and Metabolism—A Narrative Review. Clocks & Sleep. 2023.

A note on foraging safety

This content is for educational purposes only and does not constitute medical advice. Wild plants can be dangerous if misidentified. Never consume any wild plant unless you are completely confident in your identification. Some wild plants can interact with medications. Always consult your GP before using wild plants medicinally, particularly if you are pregnant, breastfeeding, or taking medication. Always wash your foraged plants thoroughly before consumption. Avoid plants growing near roads or areas that may have been treated with herbicides.