I still don't have any qualification in gardening.

qualification 是由动词 qualify（使具备资格）加名词后缀 -ation 构成的名词，意思是"资格、资质"。 gardening 是动词 garden（从事园艺活动）加后缀 -ing 构成的动名词，指"园艺活动"或"园艺行业"。 qualification in gardening 指"园艺方面的资格认证"。