Forum:Black Garden - Destructive Effekt

I couldn't find it in the rules so I like to ask you guys, when I want to activate the selfdestruction effect of Black Garden but on the field is no Plant type Monster, can I still activate the effect? I mean ince it is not a cost. Also, if I can do so, can I also summon a monster with 0 ATK like a Ojama from my graveyard?DarkSnow (talk • contribs) 03:05, May 17, 2011 (UTC)