One start I planted out 2 1/2 weeks ago (@ 52N) has definitely started flowering, so I took advantage and pollinated it Was planning on making seeds this season anyway, so I see it as a bonus, especially as I struggled to get mature seeds last year due to a combo of bad weather/late pollination.
On soil compaction: I regularly pull up weeds here who's roots have grown straight through lumps of clay that are extremely dense, so I doubt Cannabis would have too much trouble growing through pretty well compacted soil.
On the other hand, you do want your soil to have plenty of air spaces, so soil that compacts too much is likely going to impact negatively on plants. If your soil is compacting, then perhaps the initial mix needs a rethink? Perhaps you need more worms and/or to not let the soil dry out too much? I don't know as I'm only just starting to experiment myself.
I was too late for this season, but IMO getting your soil tested, and then amending as necessary from there is probably the best way to go:
https://www.icmag.com/ic/showthread.php?t=312208
Edit: PS. I also agree that much more than 12" deep is probably over kill. I've always dug deep holes/beds, and nearly always dig up my root systems after harvest to see how they have done. The results have been quite surprising for me as I've never found a substantial root system that penetrates deeper than about 1-1.5 ft.
These for example are the two Rombolts from my 2013 outdoor grow (see link in sig) which ended up at around 8 and 9 ft:
Ironically, those are the biggest/most bushy plants I've ever grown (though not the highest yielding!) and yet when those went into that bed I'd only just dug/amended/manured it. Since then the plants I've tried to grow in that bed have only reached a bit over half the size of the Rombolts at best! Hopefully this year will be different, but I'm going to get the soil tested to see what is going on anyway.
On soil compaction: I regularly pull up weeds here who's roots have grown straight through lumps of clay that are extremely dense, so I doubt Cannabis would have too much trouble growing through pretty well compacted soil.
On the other hand, you do want your soil to have plenty of air spaces, so soil that compacts too much is likely going to impact negatively on plants. If your soil is compacting, then perhaps the initial mix needs a rethink? Perhaps you need more worms and/or to not let the soil dry out too much? I don't know as I'm only just starting to experiment myself.
I was too late for this season, but IMO getting your soil tested, and then amending as necessary from there is probably the best way to go:
https://www.icmag.com/ic/showthread.php?t=312208
Edit: PS. I also agree that much more than 12" deep is probably over kill. I've always dug deep holes/beds, and nearly always dig up my root systems after harvest to see how they have done. The results have been quite surprising for me as I've never found a substantial root system that penetrates deeper than about 1-1.5 ft.
These for example are the two Rombolts from my 2013 outdoor grow (see link in sig) which ended up at around 8 and 9 ft:
Ironically, those are the biggest/most bushy plants I've ever grown (though not the highest yielding!) and yet when those went into that bed I'd only just dug/amended/manured it. Since then the plants I've tried to grow in that bed have only reached a bit over half the size of the Rombolts at best! Hopefully this year will be different, but I'm going to get the soil tested to see what is going on anyway.
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