November Flower Photos of the Day

Darren,
I can't seem to pin point the bud drop. I'm seeing it with new arrivals and we'll established oldies. I see bud drop with other nurseries media that have not been transplanted into Charlies media yet. My outdoor plants had a very consistent nutrient program all summer of Special Blend and Booster and every watering I checking and verified TDS around 700-800ppm and go as far as checking pH of nutrient water and adjust if needed. It doesn't appear the bud drop is from the Charlies time release fertilizer because most of the my hibiscus thrived in the same media same nutrients. I like to water with plain water sometimes over summer because it's hot and easier for me to feed with some time release in the soil. I also have some hibiscus in my porch with plain Charlies media that only feed with Houseplant Formula and they also drop buds as soon as the flower pokes through the case. I also have hibiscus in my porch that never drop buds and they feed with the same Houseplant formula and have amended soil with run off 2000-2500ppm. 75% of my hibiscus don't drop buds, where the other 25% do drop buds. I have watched them drop buds right before my eyes. I see a trending pattern that they drop buds when the sun shines on them either outside or inside with filtered sun. Right before my eyes they have dropped buds at 9:30am when the sun 1st hits.
I have also seen them drop buds at 11am sun. The sun seems to be the biggest culprit of bud drop.
It's possible the roots are not getting enough air or being choked so when the sun hits the top part of the plant is not getting enough water and as a result the water/sap flows back to the roots and causes bud drop. The 1 thing that is consistent is the buds only drop when they poke through the case about 2 weeks before opening or a few days before opening.
I'm running out if possible causes but it's all adding up to no not enough air at the bottom of the root zone. This is why I'm taking a close look at media types, porosity, and types of garden pots.

There is a topic called "What could be the cause of bud drop". Davidwood was having the same problem. No pest with healthy bushes. Charlies talks about a nasty hormone called Abscisic ABA which can cause bud drop from any little stresser. His solution was use hormones (kelp) to reverse ABA hormone. I give my plants kelp all the time and I tried foliar feeding with kelp for 7 days. The top of the bush profused but it turned into a profusion of bud drop late Summer into Fall.
I appreciate the kind suggestions and possibly solutions.
I'm going through and checking off every possible reason for bud drop. Doing simple things like back to the basics of nutrients and watering. Letting the soil dry more or keeping it evenly wet didn't reduce or help the bud droppers either. I even over watered but that seems to make things worse when the sun shined.
I didn't really have bud drop problems at my other location with NE exposure with the exception of doubles in heat.
This past summer I was able to stop bud drop by moving hibiscus to the North side of the home but space is limited (Pink Panther, Spaced Oddity) After 2-3pm they got full sun and was getting 10" flowers on both of those CVs. Yes I was able to stop bud drop by shading those hibiscus until 2-3pm.

Couple different views from the same Pinot Noir flower.