I’m a layman when it comes to solar installations, but I read a bit into the topic, as I want an installation on my balcony next year.

I read that partial shadows on the panels are the worst due to the connection in series of the individual plates. There are rows or even loops connected on a panel and with a part of that connected series covered in shadow, it results in a fraction of the power output. A tiny shadow results in a huge loss.

If that is your garden, you should fix that to avoid shadows onto each other.