I am attempting to grow okra around Portland, Oregon area, USDA hardiness zone 8b.
I am growing them in a makeshift greenhouse make of some clear plastic tarp over a raised garden bed. This was closed most of the time but I have left it open for the last few weeks due to high temperatures 80-90F+ I am using miracle grow raised bed soil and have mixed in some chicken manure compost
I have two plants that are around 6-8 months old (estimate). They appear to healthy however have failed to produce any pods. What happens is: a flower will appear and open, the flower will close and drop off, a small green "nub" will be left behind, then this nub and the stem that is attached to will dry up and turn brown and then fall off the plant.
I found some information about growing orka in my area which says that the night temperatures should be above 55F. I have measured soil temperatures with a temperature logger and the minimum temperature at night it 67F, max temperature during the day has been around 90F recently.
I found a person with what appears to be the same problem in this comment and the responses seem to indicate that there is some problem will pollination? Here is a video showing manual pollination of an okra flower with a q-tip. I attempted this, however I get almost no pollen to stick to the q-tip, so my guess is that the flowers are not producing pollen for some reason.
Here are some more pictures of the plant showing the dying pods flower (not fully open here, but I have seen them fully open) and my failed attempts at hand pollination note that there really is no powdery pollen as seen in the linked video above.
If anyone has any idea what could be causing the plant to not produce pods and/or pollen or has any experience with okra I would appreciate any advice as to what to try next. I was thinking at this point I may want to try some soil/pH testing, but I have no experience with this.
Update tried to remove most of the soil from around the plants and replaced it with soil that I had not added any chicken manure to as I think this would remove some of the nitrogen. Did soil testing, pH is around 6.5 and nutrient results:
nitrogen very low phosphorous medium potash high
So, I guess too much nitrogen is definitely not a problem now...because it appears that there is none...oops?
Also, the next few flowers appeared to have a small amount of pollen that I was able to put onto the stigma. Still pretty pitiful amount, but better than before which was nothing. Will see if I finally get any pods.
A few days later update: These two flowers with the small amount of pollen appear to be growing pods, finally. However I have observed other flowers blooming after this time that again have no pollen. So there is some problem causing pollen to not be produced.