Syreni Sylva Sanctuary | 2 followers on LinkedIn. A trendsetting online flower boutique brightening your space one bouquet at a time. | At SYRENI SYLVA SANCTUARY online flower boutique, we believe that there is nothing quite like the feeling of receiving a package of surprises, delivered straight to your door. We wanted to box up this feeling of joy that are our flower arrangements, and hand it right back to our customers.