I made up twelve 3x3 "raised bed" gardens for sunflowers this year. They were placed on layers of newspaper on top of old pasture, and filled with peat moss, topsoil and
compost (in that order). Sunflowers were planted 6 inches from the corners and 1 inch from corners and in the center of the 3x3 pole beans were planted. I think I planted 6 different varieties of sunflower, one (two?) of which were black seed. Some of the seed was "discount". Either 1, 2 or 3 seeds were planted per hole. If multiple plants germinated, they were thinned out at about 6-10 inch tall. Beans were planted after sunflower germination (they were inoculated).
Early on, there was some predation of sunflower leaves, but I didn't know what (I live at 56North, anything feeding at night I wouldn't have seen as the days are too long). This was much more of a problem for the beans, and it was only a couple of weeks ago I discovered that the culprit seems to be slugs. I can't get nematodes active for slugs here, so I am using beer traps. Seems to be working.
I have one 3x3 by itself on the south side of a sheltered area that is horseshoe shaped (open to east), two sites at the east end of the south leg of the horseshoe and nine sites in the horseshoe. The two sites at the east end are closest to what one might call a hay pasture. Those two sites are the only places I believe I have had deer predation of the sunflowers. Of the 8 planting locations in these two 3x3, I think I got 5 sunflower plants. At about the 1 foot to 1.5 foot level, all 5 of these sunflowers lost their heads to deer. Some lost one or more leaves to deer. One plant lost head and all leaves to deer.
This one plant, about a week ago has activated alternate growth nodes at places in the stalk where the branch of a leaf came out. All of these decapitated sunflowers are still alive, but are sort of like zombies.
Today, I noticed that one sunflower in the only 3x3 where I got 4 locations with sunflowers, no longer had a head. I am going to guess wind. The horseshoe shaped area is susceptible to wind form the east, it is pretty much protected from other directions. As an experiment, today I came along and cut all the leaves off (just leaving the "branch" sticking out of the stalk) to see if this prompts the plant to activate other growth nodes (probably too late to mature at this point). I watered all my zombies today (I don't usually water the sunflowers - I also have Jerusalem artichokes in this location and they seem to need water occasionally). Tonight I went out to check my zombies, and I noticed that this last decapitated sunflower which I deleaved today, is still tracking the sun. About the top 4 inches of the stalk is pivoting to track the sun.
At this time, one of my sunflowers is in bloom. I suspect it is an "original" sunflower, as it has another head forming off the stalk as well. The tallest sunflower I have, is about 4 feet tall. Some of these varieties are expected to get to 14 feet, so obviously this poor soil (mostly peat moss) is not providing much. I do think the sunflowers have penetrated the newspaper, but the pasture is on heavy clay.
I have given the sunflowers some water this year (3 times), where I have one teaspoon of borax per gallon of water.
Perhaps this is of interest/use to others.
I kept getting an error about abbreviations. I used the capital letter which comes after "tee", and I've replaced that with horseshoe above. Maybe that works?