Green is all organic I use the green. The best way to water three gallon pots is with a garden sprayer. Every two to three days only when it is dry with a amount of water so that they will dry out every two to three days. If you can only water the top portion that would be best. Things that will help drying are a fan, heating pad such as a electric blanket, dehumidifier is your basement is damp, but it is best to feed only when dry so that the plants can get air to the roots every 3 to 5 days maximum. If you had to hold your breath longer then you could you would turn unhealthy colors too. Not to insult you in anyway but people will remember better with me stating it like that.

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Here is a sample of a smaller one