Crabapples really struggle it the heat and humidity of the Houston area. The winters also lack the cold to support good bloom production. I suggest you try another plant instead. Roots of most any woody ornamental plant can invade a septic system if they are planted close enough to one of the field drainage pipes. Some small blooming trees to consider for your area include dogwood (semi shady area), Mexican plum (sunny area), Mexican olive or Anacahuita (Cordia boissieri)(sun), Chinese fringe tree (morning sun) or a semidwarf white crape myrtle such as 'White Chocolate' or 'Acoma'.
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