There's a tray in Kaipātiki Project nursery that has been quietly sitting for three years. The label hasn't changed. The mix has been kept moist through summer droughts and Auckland winters. Volunteers have peered at it, poked at it gently and walked away again. And this season, at last, our patience was rewarded — a single miro (Prumnopitys ferruginea) seedling has emerged.
For anyone who hasn't tried germinating miro before, let this be fair warning and encouragement in equal measure: miro seed is notoriously slow to germinate, and even after cold stratification, germination can take two to three years.
Scientific research backs up what nursery growers know through hard experience: in controlled trials, no miro seeds germinated at all for the first 18 months after sowing, with germination then continuing sporadically for over four years. Germination rates between seed batches can also be wildly inconsistent, which makes planning propagation runs a real challenge.
Part of what makes miro so tricky is its ecology. Miro's fleshy drupes are a key seasonal food for kererū, which shape seed dispersal in podocarp forests. In the wild, seeds pass through a kererū's gut and land in forest litter, where the conditions, such as shade, moisture, leaf matter, microbial activity, are precisely what the seed needs to eventually wake up. Replicating those conditions on a nursery bench takes some creativity and a lot of patience.
Miro is not alone in testing the resolve of community nursery propagators. Some other species worth flagging to your network:
- Matai (Prumnopitys taxifolia) is a close relative of miro and shares similarly slow and erratic germination. Fresh seed is essential. Matai seed loses viability quickly if allowed to dry out, so timing collection to freshly fallen fruit is critical.
- Tōtara (Podocarpus totara) germinates more reliably but benefits from cool stratification and seedlings are slow to establish and sensitive to drying out in the early weeks.
- Tī kōuka (Cordyline australis) seed is relatively easy to germinate, but viability drops off fast after harvest. Fresh seed sown immediately after collection gives the best results.
- Hebe and koromiko species can be surprisingly temperamental. Seed viability varies enormously by provenance and harvest time, and some species do far better from cuttings.
The broader lesson our little miro seedling teaches us is one that experienced nursery volunteers already carry in their bones: native plants evolved over millions of years in very specific ecological relationships, and they don't always bend to our schedules. Sometimes the best propagation tool isn't a particular technique or substrate. It's a willingness to keep checking the tray.
We'll be watching this seedling closely. In a decade or two, it will have reached perhaps three metres in height and eventually, given enough time and the right conditions, it will produce the bright red berries that make it one of the most ecologically valuable podocarps in our lowland forests.
Some things are worth the wait.