Choosing the Right Nutrients for Your Grow

In soil, your plants find what they need in the ground. In hydroponics, there is no soil. You’re the one feeding them. That means your nutrient choice matters. A lot. Pick the wrong product (or use it wrong) and your plants will let you know pretty quickly. Yellow leaves, slow growth, small yields. Nobody wants that.

We’ve been selling hydroponic nutrients at our Sunshine Coast shop since 1990. Over 35 years, we’ve watched brands come and go. We’ve tested products ourselves and heard the results from thousands of local growers. This guide covers what you need to know to pick the right nutrients for your setup, your experience level, and your goals.

If you’re brand new to all this, start with our beginner’s guide to hydroponics first. It covers systems, lighting, and the basics before you get into nutrient choices.

Why Nutrients Matter in Hydroponics

Soil is like a buffet. It’s full of minerals, organic matter, and microorganisms that slowly feed your plants over time. Hydroponics doesn’t have any of that. Your plant roots sit in water (or an inert medium like clay balls or coco coir) and they rely entirely on what you put in that water.

Every nutrient your plant needs has to come from a bottle. Nitrogen, phosphorus, potassium, calcium, magnesium, iron, plus a dozen trace elements. Miss one and your plant suffers. Get the ratios wrong and you run into lockout, where nutrients are physically present in the water but your plant can’t absorb them.

The upside? You have total control. When your nutrient mix is dialled in, hydroponic plants grow faster and produce more than soil-grown plants because they’re getting exactly what they need, exactly when they need it.

Base Nutrients vs Additives

Think of it in two layers. Base nutrients are your foundation. They contain the primary and secondary elements every plant needs to survive and grow. Nitrogen, phosphorus, potassium (NPK), plus calcium, magnesium, and sulfur.

Additives sit on top of that. They’re optional extras that target specific things. Root development, flower size, essential oil production, stress recovery, or enzyme activity. You don’t need them to grow a plant. But they can make a noticeable difference when used correctly.

Our advice for beginners: start with base nutrients only. Get your feeding routine and pH sorted before adding extras. Too many bottles too soon just makes troubleshooting harder.

For intermediate growers, a root stimulant and a bloom booster are the two most impactful additives to try first. Both Canna and FloraMax make solid options in those categories.

Grow Stage vs Bloom Stage Nutrients

Plants need different nutrients depending on where they are in their life cycle. During vegetative growth (the “grow” stage), they want more nitrogen. Nitrogen drives leaf and stem development. That’s what builds the frame your plant flowers on later.

When plants switch to flowering (the “bloom” stage), their needs change. They pull in more phosphorus and potassium to build flowers and fruit. Nitrogen drops back. If you keep feeding grow-stage nutrients during bloom, you’ll get leafy growth instead of flowers. Not ideal.

Most nutrient brands split their base line into two formulas: an “A” and “B” for grow, and an “A” and “B” for bloom. Some use a single A+B pair and adjust the ratio. Either way, you’ll want both stages covered.

Check the Canna feeding charts or FloraMax feeding charts for specific dosage schedules that show exactly how ratios shift between stages.

Organic vs Synthetic Nutrients

This is one of the most common questions we get in-store. Both work. Both have trade-offs.

Synthetic (Mineral) Nutrients

• Immediately available. Plants can absorb them right away because they’re already in a form roots can take up.
• Precise control. You know exactly what’s going in and at what concentration. Easy to measure with an EC meter.
• Clean systems. Less buildup in lines, drippers, and reservoirs compared to organics.
• Consistent batch to batch. Same formula every time you open a new bottle.
• Downsides: Doesn’t build soil biology (not relevant in pure hydro, but matters in coco or soil-hybrid setups). Some growers feel synthetic nutrients produce less flavour, though this is debated.

Organic Nutrients

• Feeds the soil food web. Great for coco, soil, and living-soil setups where beneficial microbes break down organic matter into plant-available nutrients.
• Better flavour and aroma (some growers report). This is subjective, but it’s a common claim, especially with high-value crops.
• More forgiving. Organic nutrients release slowly, so you’re less likely to burn your plants with a dosing mistake.
• Downsides: Slower uptake. Harder to measure EC accurately. Can clog drippers and lines. Not ideal for recirculating hydro systems (DWC, NFT) because organic matter can breed harmful bacteria in warm reservoirs.

Our take? For pure hydro systems, synthetic is the practical choice. For coco and soil, organic or a hybrid approach works well. Many experienced growers use a synthetic base with organic additives to get the best of both.

Liquid vs Powder Nutrients

Most hydroponic nutrients come as liquids. You measure, pour, stir. Done. Liquid nutrients dissolve instantly and are simple to use. That’s why they dominate the hobby market.

Powder (dry) nutrients are lighter, cheaper to ship, and last longer on the shelf. They’re popular with commercial growers who mix large volumes. The trade-off is mixing time. You need to dissolve them properly, and some powders don’t dissolve well in cold water.

For most home growers, liquid is easier and more forgiving. If you’re running a large operation or want to save on cost per litre, powder is worth looking at. We stock both formats in the nutrients section of our shop.

Brand Spotlight: Canna

Canna is a Dutch company that’s been making hydroponic nutrients since the early 1990s. They were one of the first brands to develop media-specific nutrient lines, meaning separate formulas for coco, soil, and water culture. That’s still one of their biggest strengths.

Their product lines include Canna Coco (for coco coir), Canna Terra (for soil and potting mixes), and Canna Aqua (for recirculating hydro systems). Each one is tuned to the specific chemistry of its growing medium. You’re not using a generic formula and hoping it works.

The additive range is solid too. Rhizotonic for root development, Cannazym for breaking down dead root material, PK 13/14 as a bloom booster, and Boost for late-stage flowering. Their feeding charts are well documented and easy to follow.

We’ve stocked Canna since the early days of our shop. It’s one of the most popular lines on our shelves. If you’re interested, we’ve put together a full breakdown in our Canna feeding charts guide.

Best for: Growers who want a proven, well-documented system with media-specific formulas. Beginners through to commercial.

Brand Spotlight: FloraMax

FloraMax is an Australian nutrient company that takes a different approach. Their philosophy is “fewer bottles, cleaner formulas.” Where some brands have 10 to 15 products in their range, FloraMax keeps it lean. That simplicity is a real advantage for people who don’t want a chemistry degree to feed their plants.

Their base nutrients are designed to stay stable in the reservoir for longer, which means less pH drift and fewer adjustments between feeds. Growers who’ve had trouble with fluctuating pH often switch to FloraMax and notice the difference straight away.

Being Australian-made, FloraMax formulas are developed for local water conditions. That matters more than you’d think. European products are often formulated for soft water, and Australian tap water (especially on the Sunshine Coast) can be harder. FloraMax accounts for that.

We’ve seen great results from FloraMax users in-store. Their Veg-1 and Flower-1 base nutrients are popular picks. Check out our FloraMax feeding charts guide for dosage specifics.

Best for: Growers who value simplicity and pH stability. Good for Australian water conditions. Great if you’ve been frustrated by complex feeding schedules.

Brand Spotlight: Supreme Creations

Supreme Creations is another Australian-made nutrient brand we carry. They produce a range of base nutrients and additives that are made locally and priced competitively. For growers who prefer to support Australian manufacturing, Supreme Creations is a solid pick.

Their formulas are straightforward and perform well across coco and hydro setups. We’ve had good feedback from hobby growers who use them as their everyday nutrients. The cost per litre is typically lower than imported brands, which adds up over a full growing cycle.

Best for: Budget-conscious growers and anyone who wants a reliable Australian-made option without the premium price tag.

You can browse all three brands (and more) on our brands page.

How to Choose: Matching Nutrients to Your Setup

With all these options, how do you actually pick? Here’s what we tell people who come into the shop.

Match the nutrient to your growing medium

This is the number one thing to get right. Coco coir needs coco-specific nutrients (they contain extra calcium and magnesium because coco locks those out). Soil setups want a soil formula. Recirculating hydro systems need nutrients designed for water culture. Using the wrong type creates deficiencies even when you’re dosing correctly.

Start simple

If you’re new, pick one brand and stick with their full line. Canna Coco A+B with Rhizotonic and PK 13/14, for example. Or FloraMax Veg-1 and Flower-1. Don’t mix brands for base nutrients. The formulas are designed to work together and mixing different base nutrients can throw off ratios.

Think about your water

Sunshine Coast tap water has a moderate mineral content. Some nutrient brands work better with our water than others. If you’re finding it hard to keep pH stable, mention your water source when you talk to us. Sometimes switching brands fixes the problem entirely.

Consider your experience level

• Beginners: FloraMax (fewer bottles, stable pH) or Canna Coco/Terra (well-documented feeding charts). Start with base only.
• Intermediate: Add a root stimulant and bloom booster. Start experimenting with organic additives if you’re curious.
• Advanced: You probably already know what you like. Come in and talk shop. We love it.

Budget matters

You don’t need the most expensive nutrients to grow well. Supreme Creations offers great value. FloraMax’s fewer-bottle approach means you’re buying less product overall. Canna is a premium choice and the results back up the price, but it costs more per cycle.

pH and EC: The Numbers That Tie It All Together

You can buy the best nutrients on the market and still get poor results if your pH and EC are off.

pH controls whether your plants can actually absorb the nutrients in solution. Most hydroponic crops want a pH between 5.5 and 6.5. Outside that range, certain elements get locked out even though they’re physically present in the water.

EC (electrical conductivity) tells you how concentrated your nutrient solution is. Too low and your plants are hungry. Too high and you risk burning roots or causing tip burn on leaves. Each growth stage has a target EC range, and it changes as your plants get bigger.

Always add nutrients to water first, then adjust pH. Not the other way around. Nutrients change the pH of the water, so adjusting pH before adding nutrients means you’ll have to adjust it again. Waste of time and pH solution.

We’ve written a full guide on this: Understanding pH and EC in Hydroponics. If you’re new to nutrient management, read that next.

Quick Summary

Choosing hydroponic nutrients doesn’t have to be complicated. Match the nutrient to your medium, start with a base pair, follow the feeding chart, and keep your pH and EC in range. That’s 90% of it.

The rest comes from experience, and that’s where we can help. We’ve been doing this for over 35 years on the Sunshine Coast. Pop into the shop in Kunda Park, give us a call, or browse our nutrients range online. We’ll point you in the right direction.