perhaps they're more like water balloons when newly born? especially more so since they're stalk was nurtured in some sort of liquid rather then the usual beanpaste from a parent?
Marisa (left): Yu, Mishter Gwound dishappeawed! It'sh wike fwying in the shky!
Anon: [I'll let her go,*] but it'll be from this height.
Sound effect: Pa [untranslated] Marisa: Yuuu! Mawisha is fwying!
Sound effect: SPLAT Marisa: YU Anon: Hahaha.
*Anon only says, "But, it'll be from this height" here, but I feel like he needs to repeat "I'll let her go" (from the previous picture) for this panel to make sense.