A 17-foot, 1-foot-wide stump in a 30-inch pot is likely Dracaena fragrans 'Massangeana' (corn plant), not a marginata.
This species prefers indoors. If moved out, it needs:
Cut top in 3-foot sections. Remove lower leaves, dip in rooting hormone, pot in fresh soil. 3–4 cuttings per 12-inch pot. Roots in ~1 month. Old trunk will resprout. Best done in warm season.
Overwatering kills fastest. Fluoride causes brown leaf spots. Keep dry, use fluoride-free water.
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