We always get excited when the Osmunda regalis fronds begin to unfurl in the bog garden at JLBG. Here are some images from this week, showing the new fronds. The rosy emerging growth is the sterile part of the fern frond, while the green growth at the top is the fertile part, which will produce the spores (fern seed). Hardiness Zone 3a-9a.
Below is another clump nearby, that emerges about a week earlier, and as such, is further along in opening.
Below is our hybrid, Osmunda x japalis ‘King Kong’, a cross between the American native Osmunda regalis and the Japanese native, Osmunda japonica. Unlike the 4-5′ tall Osmunda regalis, Osmunda japonica is much smaller (to 3′ tall), emerges 1-2 weeks later, and has dimorphic fronds—the spores are on different stalks than the foliage. Our hybrid has dimorphic fronds like the O. japonica parent, emerges later, but is much larger to 7′ tall.