Couple of questions. Are you going to get the water to them via a hose? And does it freeze, will you need to pick it all up every season?
I get the water to the beds with underground pvc pipe and then run drip hose in the bed. If it freezes, it would have to be blown out every season. Better solution in that case is hose with drip jose. Just take it down every season. If it doesnt freeze, you have more options.