You have to consider their mature size when deciding how close to the
foundation to plant them, not to mention the aesthetics of their arrangement
in the landscape. You don't write which pine trees you have, but as an
example the Eastern White Pine, Pinus strobus, can easily make 60-80' or
more over time. That's a big tree for many residential properties...
Pine trees also shed needles and will clog your gutters. If the needles
stay on the roof and rot will cause problems with the roof. Pines tend to
be week and if you are in high wind or ice conditions can drop limbs or blow
over on the house. Sorry, I'm not familiar with rowans and their habits.
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