Irrigation aid for thirsty plants (240ml)

Some plants have a relatively high thirst (especially in summer). These include Musa's (bananas). With such little helpers, you can reduce the stress a bit, as it holds about 240ml when filled and slowly releases it to the soil via the clay cone.
Some plants love this so much that they gradually enclose the cone with roots.
One water filling lasts for 2-7 days, depending on the dryness of the substrate.
Total height: 15cm
Total width: 9cm
Storage capacity: ~240ml