To express the past tense in Engpsh, you can use the past tense form of the verb "to cultivate" or "to grow," which is "cultivated" or "grew." For example:

"I cultivated flowers in my garden last summer."

"He grew a variety of flowers in his backyard."

You can also use the past participle form of the verb "to raise," which is "raised," to express the past tense. For example:

"She raised beautiful flowers in her greenhouse."

"They raised a variety of annuals and perennials in their garden."