Irish Moss - Knowledgebase Question

Trenton, MI
Question by dougtess
July 10, 2007
I have a slate patio and am trying to encourage Irish Moss to grow between the stones. The moss is mostly there but not as thick as I would like. Is there anything I can feed it or enhance the soil to get better results. Watering it is not a problem. Thank you...

Answer from NGA
July 10, 2007


Irish moss grows best in full sun to light shade and in good, well-drained soil. With time, one plant forms an attractive carpet of greenery. The key here is that it takes some time for the roots to become established. In fact, sometimes growth becomes crowded, pushing sections of the carpet upward. (If you consider this less attractive, cut out a slice of the plant and push down until the roots are in contact with the soil. Any empty space resulting from this surgery will be quickly filled with greenery.) At this point I will recommend watering as necessary to encourage healthy new growth and feeding with a water soluable fertilizer (miracle gro, Peter's, Shultz's) by diluting the granules in water and simply sprinkling the fertilizer over the tops of the plants. The ferilizer won't stain the patio and it will feed both through the foliage and through the roots.

Best wishes with your Irish Moss!

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