Ok, two.

 

Gardeners often come in to the nursery baffled by disappearing leaves.  One forager that they often too readily discount is our ever-present slug.  Believe it.  Slugs can do a lot of damage, even skeletonize leaves, overnight.

 

These photos may be helpful for the non-believer. One evening, this dahlia was beautiful and sellable.  The next day, it was compost.  And the reason was still right in the pot. 

 

This year, with the less-than-optimal summer weather, slugs are proving even more than their normal challange.  I still recommend the pet and wildlife-friendly 'Sluggo' for the job.  It's even approved for organic gardening.  However, when the downpours begin again, you may have to use it a little more often than the label generally recommends.

Shown here is Chamaecyparis pisifera 'snow' & a typical example of drainage issues.  It's a big year for that, esp. w/ conifers.

 

Note how the browning is from the top center, out.  Also note that this plant is directly off a patio, which is causing excessive water draining onto the root system.  Plus, two other C.p. 'snow's directly behind it- top right and left of picture, that weren't in the water drainage path were unaffected). 

 

Two options here are to transplant to a different location w/ better drainage or to lift the plant and build the soil w/ compost or soil booster.  This plant has been established for 3 years w/o prior problems, so the third alternative would be cross fingers, fertlize and hope for better weather.