The golden architect of the New Zealand spring. Unlike heavy, evergreen giants of deep bush, many Kōwhai species are semi-deciduous, dropping their leaves just before the big bloom to ensure their flowers are undisputed stars of the show. The tree has a unique blueprint depending on age. When young, many Kōwhai go through a divaricate stage – a tangled, messy wire-fence of zigzagging branches. This was a prehistoric defence against moa, making it difficult for giant birds to reach nutritious inner growth. As tree matures, it grows out of this awkward teenage phase and develops into a graceful, spreading canopy of delicate, fern-like leaflets. The goldilocks magic lies in the flowers. They are large, drooping tubes of brilliant yellow, shaped like a bell or a parrot beak. These flowers are specifically engineered for curved beaks of tūī, bellbirds, and kākā. The nectar sits deep at base of flower. As a bird thrusts its head inside to drink, curved petals brush against the bird forehead, dusting it with pollen. This creates a nectar fever in the bush. During peak of Kōwhai season, tūī become famously aggressive and drunk on high-sugar syrup, chasing each other through branches in a golden blur of feathers and song. However, Kōwhai hides a poison pill within its beauty. After flowers fade, the tree produces long, beaded seed pods that look like a string of yellow pearls. These seeds contain cytisine, a powerful toxin lethal to humans and many mammals if ingested. This is the tree way of ensuring that while birds are welcome to nectar, no one eats the next generation. The seeds are incredibly hardy, encased in a waterproof shell that allows them to float down rivers or drift in ocean for years, waiting for perfect moment to sprout. A tree of contrasts: a delicate, weeping beauty with a heart of gold for birds, but a rugged, toxic survivor that knows exactly how to protect itself in the wild. To see a Kōwhai in full bloom is to see the spring-time gold rush of the New Zealand bush in action.