depends on the species and how good you take care of them... like this guy... he's been blooming since april... but the purple has faded, but will bloom again in about a month...
catleya are my favorite... some are very fragrant... like this one... vandas can bloom for months straight as well... some bloom year round like epidedrum... especially in our weather.. year round blooms... and grow keiki's like crazy...
you can mount the cattleya onto your gazebo's post... and it will keep climbing upwards and bloom... i mounted this maxillaria (coconut orchid) onto a branch, and it's growing new roots and pseudobulbs...