Watering plants with ice cubes may sound strange, but it is actually a great way to hydrate hanging house plants. When you pour water over a hanging houseplant's soil, most of it speedily flows right past the plant's roots and out of the pot's drainage holes. Over time, this amounts to a considerable waste of water. For conservation-conscious home gardeners, watering with ice cubes is an effective way to release water slowly enough for a plant's roots to absorb it.
Feel the soil's moisture level with your fingers. When the top third of the soil is dry, it is time to water plants with average water needs.
Spread a few ice cubes over the top of the soil, but avoid allowing them to come into direct contact with the stem of the plant. The number of ice cubes will depend on the size of your cubes, the size of your plant and its water needs. Start out with a handful of ice cubes and then test the soil after they have melted. If the top third of the soil is still dry, add more.
Water your hanging plant with water once every two months or so. Use a watering can to water your hanging plant until it drips out of the drainage holes in the bottom of the basket. Then water again in this manner in 1/2 hour. Flushing the soil in this manner helps prevent salt buildup.