As we enter hurricane season here on Skinny Island, we turn our attention to the health of our dune, the last defense between us and hurricane surge. We’ve been fortunate, so far. Hurricane Matthew, a few years ago, breached the dune and the highway north and south of us, but our little stand of growth held firm. The dune is a narrow, fragile strip of land with remarkable attributes. Perhaps we should explain.
As this cross-section graphic illustrates, the coastal dune is not just one mound of sand, but consists of three distinct zones. All dune along the Florida Barrier Islands used to more or less look like this, but because of development, there are precious few areas now where you could see these three intact structures. The Little Hacienda sits atop the second dune removed from the ocean, in the Backdune Area, shown above. The trough between the Frontal Dune and the Backdune is occupied by state road A1A, built in the 1920s and 30s, and designated A1A in 1945. So yeah, we have a highway between us and the beach, but it’s only a two-laner, and it is iconic. I digress. Behind the house the earth falls away a good 10-12 feet in the second trough that begins the Forest Zone, where we have our Cabbage Palms, Florida Bays, and Laurel. The different zones are generally pretty narrow, especially the Frontal, which can vary from one-hundred feet, to as little as ten. And we’re losing Frontal Zone dune at an alarming rate, due to sea level rise and the recent battering of storms, which is why a concerted effort is underway by state and federal folks to shore up the physical structure in a variety of ways, and establish plant growth, which keeps the sand in place.
On a recent morning walk we took a little survey of plant life in the Frontal Zone. Happy to say, it’s looking fairly healthy.
This is Beach Morning Glory. Very hardy for such a beautiful flower. It is quite salt and wind tolerant, and a tenacious customer. It send out long runners to grip in the sand.
And below is one of the several varieties of succulents. Also very tough.
The always graceful Sea Oats. We used to see a lot more of these, but I guess they suffered losses through the series of storms we had the past fifteen years. They’re being re-introduced in many places, though. All these are native species, by the way.
A stand of Florida Agave. These are the only thing holding the dune at this point, high in the Frontal Zone, right next to the highway. Hopefully sand will build in below, if it doesn’t all wash out before.
Beach Sunflowers, perhaps the most prolific of all growth in the Frontal Zone, with the ubiquitous saw palmetto, the real hero of the dune. Palmettos have a root system you can only really appreciate if you’ve tried to dig one out. They’re very tough, but they do drown if over-run.
And we had so much rain at the end of May we are positively surrounded by these Rain Lilies up at The Little Hacienda, in the Backdune Zone. They’re everywhere, front and back. Nice to know these things still come out on their own.
The rain has been welcome in other ways, too. It’s been coming through in late afternoon and evening, rumbling out to sea after dark, and cooling things off wonderfully. The only downside is its brought out the invasive Cuban Tree Frogs again, who love to carry on all night. But it’s really a small price, and the rain has also brought more of the little musical crickets that perch in the soffit all around outside and serenade with a lovely, unpredictable grace. I guess it balances out.