Hi, welcome to OpenStreetMap and thank you for adding details to the map.

If you're adding individual plots with allotments, it might be better to tag the plot as allotment=plot and use the ref key to store the plot number.

https://wiki.openstreetmap.org/wiki/Tag:allotments%3Dplot

If there's any way in which I can help you, please feel free to ask.

-- Rob