If you can be bothered hiking out of Warsaw, this huge botanical gardens is nothing as grand as Kew, but is beautiful all the same. Magnificent magnolia collection in early spring (March/April if I remember rightly), but is well worth the trek at any time between early spring to late autumn.

www.ogrod-powsin.pl/index_a.html
Apparently the 139 goes from the city centre (but annoyingly the website does not say from where exactly!).
If you have a full day free, you can take the southbound metro to Kabaty, get out at the last stop and enter Kabaty Forest (behind the ubiquitous Tesco!). Follow the signs in the forest to Powsin (it is about a 30-45 min walk through the forest), or ask the polite Varsovians if you get lost.
You can get the bus back into town if you are pooped.

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