Question: Last fall, I planted about two dozen iris corms. I followed the directions explicitly. All the plants appear to be healthy, growing green and straight but no blooms! I was advised that they ...

The arboretum’s plant sales are a lot like the preserve’s signature oaks — growing taller and sturdier by the year. Friends of the UC Davis Arboretum started with iris corms in 1973, digging them up ...