As spring approaches, why not sow some extra seeds or divide up some clumps specifically to pass on? Many neighbours or colleagues will be delighted, and it's a good way of spreading wildlife friendly plants. Better still, stick labels to the pots with simple descriptions/growing instructions. Last year I offloaded about 15 plants and 30-odd seedlings, plus half a dozen or so part-packets of surplus seeds.
Individual sowing cells seem to work even for plants that claim not to like root disturbance provided you sow individually and plant on when well established, e.g. cornflowers and sweet scabious (which doesn't often get mentioned in wildlife gardening books but comes in many colours and is appreciated by bees, hoverflies and butterflies).