I became interested in Purple Martins last Summer after seeing a very active house in Foam Lake, Saskatchewan. I heard the sounds the birds were making and saw how active they were and used an app to identify them. A few Wikipedia and YouTube rabbit holes and some visits to PMCA later and my interest had been piqued.
So for my birthday this year, my wife got me the PMCA starter kit and I just finished putting it up this past weekend. I now have six PMCA Excluder 2 gourds in my back yard!
I live within the city limits, so I have placed the pole as far from my house as I could get away with (40ft), and as far from any trees in my back yard as I have space for. I have a nice clear (170 degree-ish?) approach to the East for my feeder, and another 40-ish degree opening to the West.
Regarding negative factors, the only big ones I believe are the two small trees in my back yard and a street light in my back lane.
I've dramatically trimmed back the smallest tree of the two that is around 12-20 feet from the feeder so that it doesn't exceed it in height. The bigger tree is about 30ft from the pole. The house I saw in Foam Lake had quite a few tall trees around it, so I'm hoping that I can overcome all these shortcomings by following all the good advice I've been reading.
The positives are: I've been hanging a bluetooth speaker on the rack, playing the dawnsong in the mornings and evenings. I have some nice fresh straw in the gourds. I've put a bit of mud around the entrances and porches.
I'm hoping that all this is enough to attract in my first year, though I know to not get my hopes up as it can take several.
Anyway, checking the scout map daily now, hoping to see more yellow dots nearby as I suspect any day now the scouts will be in my area!
