Post by Katia Hougaard, PhD

Happy First Day of Summer 2026 from Katia Plant Scientist! In the Northern Hemisphere, June 21st is this year's longest day and shortest night. This day is also known as the "Summer Solstice" because the Sun appears to "stand still" on this day. This visual phenomenon is due to the Sun reaching its Northern limit above the Tropic of Cancer before reversing direction as the days begin to shorten again. As a plant biologist and gardener, I have noticed that many garden plants in the UK begin their developmental transition from growth to the production of flowers, fruits, and seeds around this date. The production of lettuce, spinach, and other leafy greens is most abundant before the summer solstice. The edible part of these crops are the vegetative growth, or non-reproductive parts of the plant. In contrast, post-solstice crops include courgette, green beans, corn, and tomatoes. The edible parts of these crops are all associated with plant reproduction. I spend the longest day watering the garden, potting on plants I grew from seed, and removing invasive plants before enjoying a leisurely al fresco dinner under the apple tree. I hope your summer solstice was joyful and full of productivity too. #solstice #summersolstice #gardening #litha #plantbiology #plants #botany #rose #katia_plantscientist