I agree with others, that its hardly a big deal but it would be polite to ask first.
For me, the test of stealing is "did your actions deprive someone else?".
So, for example:
If you took £10 out of someones pocket, that is stealing because the person is now £10 down.
But if you watched a subscription program or football match online, instead of paying for a subscription, that is not stealing because the TV company has not lost anything (rather, that have simply not gained anything from your viewing - and that's not the same thing).
Taking the seeds does technically deprive someone else, but it is a really frivolous example, not least given seeds are usually plentiful.
Just ask, I am sure it will be fine.