Hoya sp. Rangsan is one of several undescribed Hoya species to come out of Thailand's active collector trade in recent years, still awaiting formal botanical description but already well known among Hoya enthusiasts for its distinctive foliage. The lance shaped leaves carry a dense silvery speckling across a deep green base, a natural patterning rather than a variegation mutation, giving each leaf a mottled, almost dusted appearance that varies subtly from one to the next. In its native habitat this species grows as an epiphytic or semi-epiphytic vine, climbing through humid, well shaded forest understory where filtered light and high humidity are constant. The wandering habit is visible even in a young plant, with long, wiry stems reaching out well beyond the main foliage cluster in search of something to climb, a reminder that Hoyas in the wild rarely stay compact. What makes sp. Rangsan a fun one for collectors is that it hasn't yet been pinned down taxonomically, so growing it means holding a small piece of an open botanical question. We grow ours in a chunky, well draining substrate of bark and perlite, watering once the top inch or two has dried and giving it bright, indirect light to encourage both leaf color and eventual bloom.