Rainwater? Not for every plant

Blueberries love it, lavender prefers to avoid it. Rainwater, while natural and environmentally friendly, may not be a good choice for every plant in the garden.

Rainwater tanks are a common sight these days – no wonder, as rising water prices and more frequent droughts encourage us to catch every drop. Rainwater is soft, slightly acidic and free of chlorine – making it ideal for most garden plants. But not all!

Plants that will love it

Rainwater is particularly appreciated by acidophilic plants: hydrangeas, blueberries, heather, rhododendrons and azaleas. Soft water does not raise the pH of the soil, so it does not need to be acidified with additional preparations. Potted plants such as spathiphyllums, ferns, zamioculcas, arrowroots and calatheas will also benefit - rainwater does not leave white streaks on the leaves, unlike hard tap water.

Better be careful

Not all plants will be happy to be watered with rainwater. Special care should be taken with species that prefer alkaline soil, i.e. with a higher pH. These include lavender, rosemary, common sage, viburnum, lilac (lilac), jasmine, and some perennials, such as garden carnation or auricula. Watering them too often with rainwater can lead to impaired absorption of calcium and magnesium. This is manifested by leaf discoloration, stunted growth, and weaker flowering.

Note: not all rainwater is suitable for use! Rainwater flowing from roofs covered with asbestos cement or heavily soiled gutters may contain harmful substances. It is also worth remembering to use it up as it is used – water standing in a barrel for too long can become a breeding ground for algae and bacteria.

AM