Both coconut and fig plants in your seaside location are likely suffering from improper watering frequency, not soil mix or salt exposure.
Water thoroughly, let sit in excess for 5–10 minutes, then drain. Feel the pot's weight—don't water again until it feels much lighter. Outdoors, check daily; indoors, every 3–10 days.
Consult a local garden center for fertilizer recommendations and fig variety care (sun, wind tolerance). Most potted plants die from too-frequent watering, not from too much water at once.
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