How Does Soapy Water Affect Plants? | Hunker- plant grow hand soap ,Commercial insecticidal soap is the safest choice because it's formulated specifically to control pests and minimize injury to plants. Liquid hand soaps and detergent for hand-washing dishes -- not the kind used for dish-washing machines, which typically has high sodium content -- also can be effective and, of course, are less expensive.Growing Bananas - How To Grow Banana Plants And Keep Them ...Every bit that has an eye can be planted and will grow into a banana plant. But it takes longer than growing banana suckers. Plant your bits or suckers in your well prepared banana patch, keeping two to five metres between them. The spacing depends on your layout. My bananas grow in a block of several double rows.