Can I put three cycads in my yard at the same time?

Yes, as long as there is enough space.

Cycas, Cycas like warm and humid environment, not cold-resistant, slow growth, life expectancy of about 200 years. Trees in tropical and subtropical areas of southern China 10 years old blossom and bear fruit almost every year, while Cycas cultivated in the Yangtze River basin and northern areas often do not bloom all their lives, or occasionally blossom and bear fruit. [ 1]

Like light, like iron, slightly tolerant of semi-shade. When planting in the open field in Shanghai, it is necessary to take warm measures such as straw wrapping in winter. I like fertile, moist and slightly acidic soil, but it can also resist drought. Slow growth, 10 years old plants can bloom.