My hinoki cypress is struggling
It's been a mild, wet winter here in Timonium (21093). But other plants seem just fine. In fact, my snap dragon seems ready to bloom and it really should have died months ago! I don't see any insects on my hinoki.
This looks like primarily normal browning of old foliage. (Some old foliage on evergreens die every year, the name 'evergreen' not withstanding.) There is also slight winter discoloration, which is not abnormal.
No treatment is necessary.
We would recommend that you pull back any mulch piled on the base of the trunk. Mulch should never touch trunks, where is encourages disease and pest problems.
Snapdragons are usually "annual" here, but actually are perennial in warmer climates--which we seem to be inching toward.