Consider the pros and cons of organic and synthetic fertilizers when feeding perennials
Both types of garden fertilizer contain nitrogen, phosphorus and potassium, the nutrients all plants require. Plants can absorb these nutrients however they’re made available. Both types have their place:
- Packaged organic fertilizers will improve soil structure and give plants a steady feeding, which is what you’re looking for in a permanent planting, such as a perennial border.
- In a container or a bed of annuals, where you want fast growth, you might choose a faster-acting or time-release synthetic fertilizer.
Comparing organic fertilizer and synthetic fertilizer
| Organic fertilizer | Synthetic fertilizer |
|---|---|
| Slow, gentle release of nutrients | Fast results |
| Rarely causes root or foliage damage | In high concentrations can burn roots, as well as foliage |
| Derived from natural sources, such as animal manure and rotting plant material | Derived from man-made compounds |
| Usually contains micronutrients | Rarely includes micronutrients |
| Best for building better soil and feeding beneficial organisms in it | Does not build soil structure and may harm helpful soil organisms |
| No toxicity, or salt buildup, in the soil | Contains chemical salts that over time can change soil pH |
| Nutrient analysis is inconsistent; depends on material it is made from | Can provide a consistent, specific nutrient analysis |
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