Houseplants should not be fertilized with a consistent amount of fertilizer throughout the year. The amount required depends on the season. Normally houseplants that rely on natural sunlight are not fertilized at all from November through February as the light levels are so low that fertilizer is not needed. The light intensity is less during the winter as the sunlight must pass through more of the atmosphere resulting in less light energy. Also, the days are shorter resulting in even less light available for growth. Fertilizing during these dark months can do harm. Fertilizer are salts and can build up in the soil if the plant doesn’t take them up due to slow growth. Eventually the fertilizer salt content can reach a level that roots are burned.
So what is a simple method for fertilizing houseplant? Fertilize at the rate recommended on the label of your fertilizer from March through October. Don’t fertilize at all during November through February unless the plants are receiving supplemental lighting. If they are, then fertilize the same amount throughout the year.
If your fertilizer recommends fertilizing once a month, try splitting the concentration recommended in half and fertilize twice a month. The total amount is the same but the frequency is doubled which may result in a more efficient use of the fertilizer. (Ward Upham)
So what is a simple method for fertilizing houseplant? Fertilize at the rate recommended on the label of your fertilizer from March through October. Don’t fertilize at all during November through February unless the plants are receiving supplemental lighting. If they are, then fertilize the same amount throughout the year.
If your fertilizer recommends fertilizing once a month, try splitting the concentration recommended in half and fertilize twice a month. The total amount is the same but the frequency is doubled which may result in a more efficient use of the fertilizer. (Ward Upham)
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