| Yes, when you cross you have to make sure the plants are more related. Some cattleya alliance plants are cattleyas, laelias, diacriums, broughtonias, sophronitis, brassavolas, etc. These may be compatible, with many intergeneric combinations possible. Oncidium alliance plants don't mix with catts (or phals or dends), so you should only find combinations of odontoglossoms, oncidiums, miltonias, cochliodas...
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~~Lily~~
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