I have 3 large planter boxes (4'x12') that have a variety of veggies, fruits and herbs. I've been growing from seed, directly in the boxes. I have drip irrigation setup but the drips don't always hit the seeds (the drip holes move because they can't really be staked down, or the holes are too far apart so the seeds in between don't get much water). Is there a better way to set the irrigation up? Should I use spray rather than drip? I'm totally new to irrigation (our gardener installed the current system) so looking for some easy to understand guidance. Thanks!