Impersonal Se

Hola Tina

It needs the verb in the plural form "se pueden" because there is a direct object and this is in plural, so it'd be "lots of flowers can be seen": se pueden ver muchas flores

There is a wrong tag in that sentence. It takes you to impersonal sentences instead of passive se sentences, so we'll fix that soon.

This is where you can learn about passive se sentences using se debe(n)/se puede(n).

I hope this clarifies it.

Saludos

Inma