I've normally only grown in 5 gallon Smart Pots with commercial soil, outside but this year for the first time I put three plants in 5 gallon buckets. I drilled several holes in the bottoms and I filled them with an interesting soil mix. When pruning some neglected juniper bushes, I found some very, very rich soil underneath them that had been created from years of aspen and maple leaves breaking down over the course of 20 years. I then mixed this with dried pine needles from my neighbor's pine tree for aeration. This soil was full of worms so it was kind of like a natural worm bin and leaf mold. The soil drains really really well but it is really heavy so it's just been hard to know when to water. So far everything looks good but I'm always unsure if I'm watering too much. What are some suggestions for knowing when to water?