Yew Hedges not looking great! Help!
First time posting on here so apologies in advance!
My wife and I had planted 66 yew hedges in the weeks leading up to Christmas time (2018). We tried to prepare the soil as best as we could with hand tools, using a good amount of rotten manure in the process. Through the winter the hedges all looked pretty healthy and were all of a similar colouring. During early spring, when we began to get the occasional dry spell, we made it a point to water the hedges (generally once a month!). We also gave them a very light pruning as we read that it would encourage bushiness! We fed them using a seaweed liquid solution for good measure too!
Unfortunately, in the last month or so, two of them began turning an orange-brown colour. We’ve given them a little more of a watering, laid some fresh compost around their bases, and foliar fed them using the seaweed liquid the other day. We try our best to stay on top of the weeds, so we’re wondering what on earth could be going wrong with these two, and if it’s a sign of something we’re doing wrongly? Should we be watering them more often in this weather, or perhaps foliar feeding them more often? Also, do we have any chance of saving these two?