Agree. The smaller particles of clay soil binds together more easily, removing air and making water harder to seep through to the plant root. Water also drains more slowly because of it. Lack of air is damaging to plants and other beneficial worms and organisms.
Definitely adding organic matter helps in improving clay soil and making it more amendable to planting. It pushes apart the soil's small particles. You can make use of the compost you have from your pile or bin, or buy some from your local gardening shop. Adding sand or grit is a short term solution compared to this, as it won't improve fertility or feed the soil-dwelling creatures that'll help your soil.
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