Recommend a Fair Solution for a Missed Garden Renewal

You serve on the committee at Bracken Gate Community Garden. Long-time gardener Rowan missed the plot-renewal deadline while helping a relative move. Coordinator Elise Tran has already assigned Rowan's former plot to first-time participant Casey, who has bought seeds. Rowan wants the old plot back. One larger plot remains unassigned and could be divided, but neither gardener has agreed to sharing. Elise asks for your advice before replying to them, hoping to retain both participants without undermining the renewal process.