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Between 1856 and 1863 Mendel cultivated and tested some 29,000 pea plants (Pisum sativum). This study showed that one in four pea plants had purebred recessive alleles, two out of four were hybrid and one out of four were purebred dominant.
Yes, pea plants don't grow in air. Mendel was doing experiments in trait inheritance. If you want to do similar experiments, you need to have the materials, the space, and the knowledge of how to grow pea plants. You also have to keep good notes on which plants are grown from which seeds in order to track the traits. Mendel grew his pea plants in a small garden plot.