CREATE TABLE table_203_700 (id DECIMAL, "year" DECIMAL, "species" TEXT, "height" TEXT, "location grown" TEXT, "state" TEXT, "notes" TEXT)

the species with the least height
SELECT "species" FROM table_203_700 ORDER BY "height" LIMIT 1
SELECT "species" FROM "table_203_700" ORDER BY "height" NULLS FIRST LIMIT 1