We've got a Thuja Smaragd and a Gardenia that both have different issues we can't figure out.
The Thuja - it seems to be browning in one part near the center. It's been outside all summer, it's never had pests, it seemed to be doing fine. Then over the course of a few days, we added a bit of the community compost from our building and at the same time our weather here in Montreal went from cool (18C) to intense heat with humidity (31C) to cool again.
The Gardenia - Has been lovely all summer, and even had a nice blossom in mid July. But in the past 2 weeks we started noticing the yellowing seen in the photos. We also added the compost here
Care - Both plants are watered when necessary with a regular fertiliser. In the Gardenia we added epsom salts because we read in several places that it was helpful for Gardenias to provide minerals and to try to avoid yellowing.
Questions:
1. Could the temperature shift back and forth have affected both plants?
2. Could the Thuja be underwatered?
3. Is the Thuja showing obvious signs of nutrient deficiency?
Thanks for any help!
The Thuja...
Thuja trimmings:
The Gardenia yellowing:
