A key to growing them - like many plants - is good drainage. This summer mine were in full bore sun on my deck which was from ~ 9:30 AM to sundown. For much of August and September, temps were 85 - 100 daily. During that time we did not get a lot of rain. As a result, I had to water Brugs (and Oleander) at least once a day and sometimes twice daily. If it rained, I could skip that day and usually the day after.
We basically got no rain in October when temps had abated a bit.
Two other observations. Brugs are heavy feeders and have a relatively extensive root system. Sounds like your situation is flip side of me - lots of moisture. To the extent that is the case, you will want to situate the plant (plants since you have a bunch of seed :-)) so you have control of how much water nature provides. It is easy to add - but impossible to take it away for all practical purposes.
