2025/2026 Native Grass Planting
Over the Summer of 2025, we took a pasture walk through SMI 1 to survey the general composition of grasses. Various native bunchgrass plantings, previously thought to have been relatively ineffectual, were visited and visually surveyed. Many of the sites within Smi 1 that had been sown with grass plugs had thriving communities of mature bunchgrasses, especially those where Purple Needle Grass (Nassella Pulchra) had been sown. A decision was made to revive the program!

Ten species of native California perennial grasses were chosen by our native nursery expert Matthew Weger and sewn into trays by him and the rest of the SMI team. Luckily, the shade house that was built years ago for this exact purpose still stands and after replacing some of the aging shade cloth, it was ready to go. 125 trays totalling 17,136 total cells (breakout below) were seeded over the course of two days in mid October and the irrigation set to water. By the first week of November, the trays were thinned out to one plant per cell.

An unusually foggy late October/early November restarted the growth of our grass plugs significantly and through the persephone period (Nov 18th through Jan 23rd in Sonoma County), when the amount of sunlight drops below ten hours, the grass plugs experienced very little growth. Thankfully, the sun came out in February and by the middle of that month, the plugs were ready to plant in the ground.


The planting strategy took two distinct approaches. The first was to locate narrow but long stretches of pasture that bridged variously changing topographies, soil types, and sun exposures. A sequence of all the grass plugs was then repeated into the strip to test which species might do well and where. The second was site specific plantings that targeted conditions we consider preferable to specific species based on our years of pasture walks on Sonoma Mountain (not to mention thousands of hours of herding cattle across them!). For example: Two large plantings of Nasella Pulchra were undertaken on open, western facing slopes in thin rocky soils.

As an extension of the planting, 300 plugs were up-potted into 2″ pots to over summer in the shade house. These more mature grasses will be planted in the early fall after the first rain to discover whether their maturity increases the survival rate in similar contexts as the smaller plugs were planted into.
As always, the unpredictable rainfall and Spring temperatures (an extremely hot and dry March) gave the grass plugs plenty to contend with. However, after digging up a couple in late April to check on progress, we found roots that had struck down as much as 7 inches into the soil. This seems to have also occurred in plants that hadn’t expressed a great deal of blade growth, giving us hope that their prioritizing of root growth increases their chance of longevity. Whether they will survive the summer and go to seed next spring remains to be seen. As with all things, nature runs the show, but if even 10% of the plugs survive and go on to foster growing communities of bunchgrasses, we’ll consider that an enormous win.
Grass Plugs Planted (total = 17,136)
Blue Wild Rye (Elymus Glaucus) – 2016
Pine Blue Grass (Poa Secunda) – 1008
California Melic (Melica Californica) – 2016
California Oatgrass (Danthonia Californica) – 2016
Purple Needle Grass (Nassella Pulchra) – 3025
Idaho Fescue (Festuca Idahoensis) – 2016
California Brome (Bromus Carnatus) – 2016
Meadow Barley (Hordeum Brachyantherum ssp californicum) – 1008
Meadow Barley (Hordeum Brachyantherum ssp brachyantherum) – 1008
Molate (Festuca Rubra) – 1008































