If your serious about coming into the aquatic world of live plants.. there's alot more to it than just sticking it into some dirt.
I wouldn't be too sure. A tank with some soil, a little bit of gravel on top of that, and some plants in there can do great sitting on a window sill (breaking three "rules" of planted tank keeping and neglecting another 3 - water changes, CO2 and ferts).
"dirt" could mean anything but DOC's that you're likely to find in compost etc are very good for plant growth so no I don't think you're dad's crazy, I'd be interested to know who he learnt that little bit of advice from.
At the risk of over-simplification, there are two types of aquarium technique known to create good plant growth. The first is the "hi-tech" setup, which includes deliberately setting up an unbalanced aquarium and using regular maintenance and cleaning to counter this. Hi-tech aquariums can look absolutely stunning. Look into "Takashi Amano" and "Nature Aquariums" for more info. They're often characterized by CO2 injection, fantastic plant growth and often a "zen" influenced minimalist look.
The second type is the "low-tech" aquarium approach as pioneered by Diana Walstad. Her book "Ecology of the Planted Aquarium" describes and justifies the approach very thoroughly and methodically. Low-Tech aquariums are charectorised by stable pH, large amounts of plants and natural fish behavior,
Chris