If you have trouble remembering when to water your plants, you might be interested in this self-tilting vase design concept that gets horizontal when its plant gets thirsty. Once it's properly hydrated, this pewter container stands up—albeit at a somewhat tilted angle—held up by the weight of the water within. Simple, yet elegant. [Yanko Design]
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I usually use a clear vase, then if you notice the water level is low, you can fill it. If that does not work, then when leaves begin to wilt add water and fertilizer. If you can not manage that buy fake plants.