Royal mail's maximum delivery weight is 30kg - this means we can only send a maximum of 2 large bags in one order. Recycled crushed, washed and dried whelk shells. This is ideal for the indoor plant pot and terrarium top dressing. Great for cacti, succulents and most houseplants. Alternatively, you can mix the shells into soil or compost to increase drainage. This is a mini version of our popular classic small bag, and is the perfect size for gifting or adding to your own hampers (contains approximately 1kg of shells). This bag size is ideal for top dressing small indoor plant pots. Great for cacti, succulents and houseplants. Alternatively you can mix the shells into soil or compost to improve drainage and aeration. Our potting cup is the perfect tool for scooping and decanting shells and other substrates. This is a natural product from the sea. We do our best to remove any foreign material. Paper bag and tie handles - 100% recyclable.