Asking for a friend (I swear!)
She treated and fertilized her hinoki sekka as follows:
Early-mid April - used the Bayer Feed and Protect systemic annual treatment - at 1 tbsp per gallon.
Early April - used the Bonide granulated systemic - used the recommended amount which equates to roughly a light dusting over the container surface - example 1.5 tbsp for a 5 inch pot.
Mid-July - reapplied the Bonide systemic for last treatment for summer.
These first two fertilizers below were given on a really hot day about 8 weeks ago - whenever that first real hot spell came that lasted about a week. It was on a 90+ degree day. Other plants reacted to this badly also - with some burned edges - but at first this tree seemed un-phased.
Neptunes’ Harvest fish fert - Full strength 1/8 cup per gallon - applied this both as foliar spray and in soil watering
GS plant food Liquid Kelp - Full strength 2 tbsp per gallon - applied this both as foliar spray and in soil watering
(Below are newer fertilizers I bought to replace the ones above after the seeming bad experience and horrendous odor from both of them.)
Bio-Weed Seaweed fertilizer - may have had a small amount in one or two watering - but it’s like 1/2 teaspoon per gallon at full strength.
Garden Safe Insecticidal Soap (+ Isopropyl alcohol) mix - applied once to Sekka about 3-4 weeks ago. The browning had already started by this point but it has gotten much worse over last week to two weeks.
Bottom line, recently the tree started looking stressed, losing leaves and branches. She thinks the cause is over fertilizing during hot weather. I checked the tree and it’s fairly wet, but no sign of root rot (at least no odor). I recommended she slip pot in pure pumice to help roots dry out a bit, which she did yesterday.
Any other thoughts? Any experience dealing with this for Sekkas?
Here are some photos.