“Nitrogen, Phosphorus, Potassium. ‘Up, Down, All Around’. Come on, Jess, it’s so easy!”
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This was my introduction to the basics of horticulture from my dependable schoolmate, Ray. Having re-entered college after an extended absence, Ray was my own personal coach helping me understand the science behind the art of horticulture.
For the new or intuitive gardener (like myself), the chemistry behind the action of fertilizing can be intimidating. I have often witnessed gardeners in the fertilizer aisle going from one product to the next trying to decipher the label and the numbers, confused by symbols they barely recollect from their high school science lessons. Up, down all around. That’s when Ray’s little pearl falls from my lips.
This simple phrase is an easy way to remember the primary nutrients your plants require to achieve successful growth:
When you purchase a fertilizer from your local garden center, the ratio of nitrogen (N), phosphorus (P) and potassium (K) will be listed on the container in the form of three numbers. These numbers tell you the percentage of N, P and K in the fertilizer blend they have combined as their special product. For example, if you wanted to purchase an all purpose fertilizer with equal parts N P K, then you might choose a product that had a ratio of 4-4-4. If you were looking for something more appropriate for transplanting, when you want to promote root development, you would want a higher middle number such as a 2-8-4.
The three elements we are discussing above are just the basics–the primary macro-nutrients. Plants also need other elements, known as micro-nutrients, to achieve successful development. Magnesium, Calcium and Iron are also key factors in garden health–the lack of which can cause weakness in your plants.
The only accurate way to determine what your soil has or what it does not have is through a soil test. However, if you take a closer look at your plants, you can sleuth out some deficiencies on your own.
If you have discovered through a soil test or visual inspection that your plants are deficient in any of these minerals, you have two choices as the delivery method to compensate what is lacking.
The most common choice is a salt based or synthetic fertilizer. Due to the production methods, negative environmental consequences and the unknown long-term effects, these products have received much criticism over the years. The spectrum of nutrition they provide is often narrow and without the trace elements (micro-nutrients) that plants need. The benefit of synthetic fertilizers is that they provide large dosages of the macro-nutrients in a way that is readily accessible to plants. This has allowed for agriculture to flourish in nutrient poor soils and thus feed our rapidly growing population.
In my own garden, I prefer to use sources that are naturally derived to support the over all soil complex. The analysis of these substances is often much lower than the synthetic varieties but more compatible to my labor force of worms and other microorganisms like bacteria and mycorrhizae. Natural fertilizers build soil structure because they are of an organic base. They improve aeration, hold moisture and nutrition better and complement the growth of the beneficial organisms. Using natural amendments helps mimic what we would find in a healthy natural system. To compare the scenario to our own bodies, it would be like choosing whole foods versus processed food to provide us with energy and nutrition.
When it comes to growing healthy plants, whether in your garden, indoor pots, or a full-scale farm, there’s one thing that can’t be overlooked: fertiliser. If you’re a seasoned gardener or just starting, you’ve likely heard a lot about it. But here’s the catch—using fertiliser is not a one-size-fits-all process. Plants have unique nutrient needs at different growth stages, and understanding when and what to feed them can make a world of difference.
In this blog post, we’ll break down the essentials of choosing the right fertiliser for each stage of plant growth.
Think of plant growth like a marathon, not a sprint. At each stage, a plant focuses on different activities—seedlings are focused on building a strong root system, while mature plants are directing energy toward flowering and fruiting. Just like how a marathon runner adjusts their diet at different points in their training, your plants need a nutrient boost that aligns with their growth phase.
There are three key nutrients that all plants need, known as macronutrients:
Most fertilisers are labelled with an N-P-K ratio, which indicates the balance of these nutrients. The trick is to match the fertiliser’s N-P-K ratio with what your plant needs at its current growth stage.
At the seedling stage, the focus is on establishing a strong root system and healthy, initial leaves. This stage is crucial because a plant that develops healthy roots early on will have a stronger foundation to thrive later. However, this is not the time to bombard your plant with nitrogen-rich fertilizer.
What to Look For:
Fertilising Tip:
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Dilute liquid fertilizers to half the recommended strength to avoid “burning” your tender seedlings. Less is more at this stage!
Once your plants move beyond the seedling phase, they enter a phase of rapid leaf and stem growth. During this time, your plants need an extra dose of nitrogen to fuel the production of lush, green foliage. This is especially true for leafy vegetables like lettuce or spinach, but even flowering plants need a strong foundation of foliage before they can produce flowers or fruit.
What to Look For:
Fertilizing Tip:
Feed your plants every 2–3 weeks with a nitrogen-rich fertiliser during this phase. For best results, water the plants before applying fertiliser to prevent root burn.
As your plants begin to flower and, eventually, produce fruit, their nutrient needs shift again. This is where phosphorus and potassium step into the spotlight. Phosphorus helps boost flower development and fruit set, while potassium strengthens the plant, making it more resistant to disease and stress.
What to Look For:
Fertilizing Tip:
Stop using high-nitrogen fertilisers at this stage to avoid overly leafy plants at the expense of flowers or fruit. Apply phosphorus-rich fertiliser at the base of your plants to encourage strong roots to support the flowering process.
As your plants mature and begin to wind down, especially if they’re perennials or fruiting trees, you need to help them prepare for the harvest or overwintering. During this stage, potassium becomes the most important nutrient. Potassium helps strengthen cell walls and improves the overall health of the plant, making it more resistant to disease and environmental stress.
What to Look For:
Fertilising Tip:
If you're preparing plants for winter dormancy, avoid high-nitrogen fertilisers in late fall, as they can encourage new, tender growth that won't survive the winter. For vegetables nearing harvest, reducing fertiliser application two weeks before picking can improve flavour, particularly for fruit-bearing plants.
Both organic and synthetic fertilisers have their pros and cons, and the choice depends on your gardening style and plant needs.
For most gardeners, a mix of the two works well: use organic fertilisers to build long-term soil health and synthetic fertilisers for quick fixes or during critical growth phases.
Fertilising your plants is as much about timing as it is about choosing the right product. By understanding the distinct needs of your plants at each growth stage, you can tailor your feeding strategy to maximize health and productivity.
If you're ever unsure, start with a balanced fertilizer like a 10-10-10 and adjust based on how your plants respond. And remember, more fertiliser isn't always better. Over-fertilising can damage plants and even stunt their growth, so follow instructions carefully.
Happy gardening! Your plants will thank you with stronger growth, beautiful blooms, and delicious harvests.
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