UBCNews - Business - Gardener's Guide To Fertilizer Types: Which Nutrients Are Your Plants Craving?

Episode Date: January 19, 2026

So, have you ever stood in a garden center staring at rows of fertilizer bottles and thought, what on earth does my garden actually need? I mean, there's granular, liquid, organic, synthetic���it's overwhelming. GS Plant Foods City: Lake Mary Address: 4300 West Lake Mary Boulevard Website: https://gsplantfoods.com/

Have you ever stood in a garden center staring at rows of fertilizer bottles and thought, what on earth does my garden actually need? I mean, there's granular, liquid, organic, synthetic? It's overwhelming. Oh, absolutely. I think every gardener has been there at some point. And honestly, the good news is, once you understand the basics, it becomes a lot simpler. Let's start with the most common types.

You've got synthetic fertilizers, which are. are chemically manufactured and deliver nutrients quickly. Then there are organic options which come from natural sources. Think compost, animal manure, or seaweed. Right. And each one has a different job, doesn't it? Exactly. Synthetic fertilizers are fast acting, so they're great if you need to correct a nutrient deficiency quickly. But organic fertilizers work more slowly because they rely on soil microbes to break them down. The trade-off is that organic options improve soil structure over time and are gentler on the environment. That makes sense.

And then within those categories, you've got different forms, right? Like liquid versus granular? Yes, liquid fertilizers are absorbed faster, especially useful for container plants or when you need to address deficiencies right away. Granular or powder forms release nutrients more slowly, which can be great for long-term feeding. There are also water-soluble powders that dissolve quickly and act. similarly to liquids.

Mm-hmm. That's really helpful. So how do we figure out what our plants are actually craving? I mean, how do you know if your tomatoes need more nitrogen or your roses need phosphorus? Great question. The first step is understanding the big three, nitrogen, phosphorus, and potassium, often called MPK. Nitrogen promotes strong, vigorous growth in those dark green leaves we all love.

Phosphorus strengthens roots and supports flowering and fruit production. Potassium improves overall plant health and helps with resistance to temperature extremes and diseases. So if my plants look pale or aren't growing well, that could be a nitrogen issue? Often, yes. Yellowing leaves, poor germination, and a general lack of vigor can all point to nutrient deficiencies. And here's the thing. Mineral deficiencies also weaken a plant's resistance to pests, disease, drought, and frost. So keeping your soil nutrient rich is really about building resilience.

You could say it's about giving plants what they need to thrive, or put another way, it's making sure they have the tools to stay strong under stress. I see makes sense. Well, beyond the big three, plants also need essential micronutrients, things like iron, manganese, zinc, and boron. And this is where some of the natural fertilizers really shine. For example, seaweed-based products are are packed with trace minerals plus natural growth hormones like cytokinns and oxen. These help with root development and nutrient uptake. You know, I've heard seaweed fertilizers mentioned a lot lately. What makes them so special?

Seweed, especially kelp, acts as a biostimulant. That means it promotes natural processes within the plant, like photosynthesis, and it even slows down senescence, which is the aging process. So plants can produce for longer periods. It also helps plants cope with stress from extreme weather. Heat, drought, frost, you name it. I remember one year, my basil was really struggling midsummer, and after using a kelp solution, it bounced back within a week.

That was my aha moment with seaweed. That's really cool. I had no idea it could do all that. Yeah, and one of the best sources is cold-processed kelp from the North Atlantic, specifically ascafillum nodosum. The cold extraction process preserves all those bioactive compounds, so you get maximum effectiveness. It can be applied as a foliar spray where the nutrients absorb directly through the leaves or as a soil drench at the plant base. Okay, so let's say I'm ready to pick a fertilizer for my home garden.

Walk me through how to actually make that choice. Sure. First, think about what you're growing. Are you focused on leafy greens, flowering plants, or fruiting crops? For general purpose feeding, a balanced NPK ratio, like 2020, works well across all growth stages. But if you want to boost root strength, stress resistance, and overall vitality, that's where liquid kelp solutions really stand out. So liquid kelp isn't just a fertilizer.

It's more like a plant superfood? Exactly. It's loaded with over 60 trace minerals and natural growth hormones. And because it's organic and OMRI listed, it meets national organic program requirements, so it's safe for edible plants like vegetables, herbs, and fruit trees. Plus, a single gallon of concentrate can yield up to 800 gallons of nutrient-rich solution. So it's cost-effective, too.

That point about natural growth hormones and kelp sets up our next piece, application methods, and timing. But first, a quick word from our sponsor. Looking for plant nutrition that's truly organic and natural? G.S. Plant Foods offers fertilizers formulated from all natural ingredients, including liquid kelp sourced from cold-processed Ascafellum-Nodosum harvested from Norway's clean North Atlantic waters. Their Omri-listed products are safe for people, pets, and edible plants, delivering powerful results for gardens, lawns, houseplants, and crops without harsh chemicals.

Whether you need liquid concentrates or water-soluble powders, find solutions designed for home gardeners and farmers alike at the link in the description. Picking up on those natural growth hormones, how often should home gardeners be applying kelp-based products for best results? Great question. During the growing season, weekly or bi-weekly applications work well. If you're using it as a foliar spray, apply in the early morning or late afternoon to avoid direct sunlight, which can reduce absorption. And here's a pro tip. Liquid kelp helps plants recover from stress like

transplant shock or extreme weather, so it's smart to apply it right after those events. That's really practical advice. And, you know, another option is combining kelp with other organic ingredients, right? Oh, definitely. For instance, blending seaweed with hydrolyzed fish fertilizer gives you an NPK boost along with those trace minerals. Some gardeners swear by that combination, though I'll warn you, your neighbors might wonder if you're secretly running a fish market. Ha! Yeah, I've heard the fish blends can have a bit of an odor. They can, yeah, but most people find the results. Healthyer, more vigorous plants are worth it, and the smell fades pretty quickly outdoors. Makes sense. So to everyone listening, if you're trying to choose

the right fertilizer, think about three things. What your plants need at their current growth stage, whether you want fast acting or slow release, and how comfortable you are with organic, synthetic. And remember, less is often more. Even with organic fertilizers, overapplication can overload your soil with nutrients and salts. Absolutely. Less is more. Start with the recommended rates, observe how your plants respond, and adjust from there. Healthy soil and healthy plants come from understanding what they're craving and giving them exactly that. Well said. Together, we're all learning to be better stewards of our gardens. Thanks. so much for breaking this down today. My pleasure. Happy gardening.