Seed Merchants, Johns... Seal

Johns... Seal, Image & Found by Shona Jeffcock Was Birks‎.
Found in South Yorkshire, ?mm

JOHNS... curving downwards / SEEDS straight across middle // (BRI?)STOL / (EN)GLAND

Several seed merchants are known from Bristol but not one beginning with Johns...

One possible company is Johnsons who have been established since 1820 but they are based in Suffolk.