Growing sea hibiscus

I eventually planted over two dozen sea hibiscus saplings and seedlings, which I’d been nurturing for six months, all the way from a sackful of seed pods, to a tray of seeds on the kitchen counter, to pots on the lanai. I'd moved them around the lanai when they were threatened by downpours, repotted them twice as they grew, sprayed them when something unpleasant and invisible was eating their leaves, until finally they pleaded to be put out.

Here's a stalwart Tonga native who knows how to grow these things from a trunk like the one he has in his hands. These are clearly as easy to grow as sticking a bare trunk in the ground and watering it. 

I failed at this simple approach. Apparently seed propagation is my thing, instead. 

Who knew?  I do not consider myself a gardener, but maybe I need to rethink this. 

The initial vision I had was of a living fence lining the path leading to our back patio. Someday we would even put an arched trellis in place at the entrance to this path.

Here's what such a boulevard might look like.

If they get truly out of hand, I understand sea hibiscus can be invasive. 

I guess I should fear for the foundations of our home, but I figure by then we'll be long gone and it won't be our problem. I could, of course, be wrong and come to regret this.