PROBLEM: ‘I move pots about so I always have flowers in bloom on my deck, but some are too heavy. Can I lighten them?’
SOLUTION: Use foam packing peanuts instead. They are around $7 for 100g, from stores like Officeworks. Fill the pot one-third to one-half full with packing peanuts and cover with landscape fabric, then top up the pot with a good-quality potting mix. While this planting method lessens the weight of the pot, it will need more frequent watering due to the reduced amount of soil. Cover the mix with bark mulch to help retain moisture.