Why Nutrients Matter
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What Do Nutrients Do?
In traditional gardening, plants get nutrients from soil.
In a Tower Garden, the water delivers nutrients directly to the roots instead.
These nutrients provide the essential minerals plants need for:
- Leaf growth
- Root development
- Flowering
- Fruit production
- Overall plant health
Without proper nutrients, plants may:
- Grow slowly
- Turn yellow
- Wilt
- Develop weak roots
- Produce smaller harvests
How Tower Garden Nutrients Work
Tower Garden nutrients are designed specifically for plant and human health.
The nutrients dissolve into the water reservoir and circulate through the tower, delivering minerals directly to plant roots.
This allows plants to:
- Grow faster
- Use nutrients more efficiently
- Produce larger harvests
- Avoid many soil-related issues
Because the nutrients are delivered directly to the roots, maintaining the correct balance is important.
Too little can slow growth. Too much can stress plants or cause nutrient lock.
How Much & How Often Should You Add Nutrients?
Start new seedlings with half-strength nutrients. After that, replenish nutrients based on the current growing conditions—full strength during normal weather, half strength in hot weather, and quarter strength during periods of extreme heat.
🌱 Starting New Seedlings
10 ml A + 10 ml BUse this amount per gallon of water when first placing new seedlings into your Tower Garden.
🥬 Normal Replenishing
20 ml A + 20 ml BReplenish nutrients at full strength during normal growing conditions.
☀️ Hot Weather
10 ml A + 10 ml BReplenish nutrients at half strength during hot weather to reduce plant stress.
🔥 Extreme Heat
5 ml A + 5 ml BReplenish nutrients at quarter strength during periods of extreme heat.
💡 Top Tip: Calculate nutrients only for the amount of water you are adding. For example, if you add five gallons of water, add nutrients for five gallons—not for the full reservoir.
Read the complete guide to how much and how often to add nutrients →
How to Mix Tower Garden Nutrients
Mixing Tower Garden Mineral Blend correctly only takes a minute. Follow these four steps whenever you fill or replenish your reservoir.
1️⃣ Fill the Reservoir
Add fresh water to the reservoir before adding either nutrient concentrate. This allows the minerals to disperse properly.
2️⃣ Add Part A
Measure the correct amount of Mineral Blend A and pour it directly into the reservoir water.
3️⃣ Add Part B
Measure Mineral Blend B and add it separately. It does not matter whether Part A or Part B is added first.
4️⃣ Check the pH
Allow the solution to circulate for a few minutes, then test the pH and adjust it if necessary.
💡 Top Tip: Never mix concentrated Part A and Part B together before adding them to water. Combining the concentrates can cause some minerals to react and become unavailable to your plants. Add each part separately to the reservoir.
Understanding pH
pH affects how easily your plants can absorb the minerals in your nutrient solution. Even when nutrients are present, plants may struggle to use them when the pH is outside the ideal range.
🌱 Why pH Matters
The pH of your reservoir affects nutrient availability. Keeping it within the proper range helps your plants absorb the minerals they need for healthy growth.
⚖️ Ideal pH Range
Most Tower Garden crops perform best between:
5.5–6.5Within this range, plants can absorb nutrients more efficiently.
🌿 Signs to Watch For
- Yellow leaves
- Brown spots
- Slow growth
- Curling leaves
🔎 When to Check It
Check the pH when plants suddenly begin struggling despite receiving the correct nutrients and enough light. Test before adding more nutrients, since an incorrect pH may be preventing absorption.
Need help testing, adjusting, or stabilizing your reservoir pH?
Read the Complete Tower Garden pH Guide →Should You Use an EC or TDS Meter?
EC (Electrical Conductivity) and TDS (Total Dissolved Solids) meters measure the concentration of dissolved minerals in your nutrient solution. While they can be useful, most Tower Garden owners can grow successfully without one.
📊 What Does an EC Meter Measure?
An EC meter measures the electrical conductivity of your nutrient solution, giving an indication of how concentrated the dissolved minerals are.
💧 What About TDS?
A TDS meter estimates the amount of dissolved solids by converting the EC reading into parts per million (ppm). Different meters use different conversion scales, so readings can vary.
🏡 Do Home Growers Need One?
Not usually. If you're using Tower Garden Mineral Blend at the recommended strength, an EC or TDS meter is generally unnecessary. Most home growers can rely on proper measuring and healthy plant growth.
🌿 Watch Your Plants
Healthy leaves, steady growth and good colour are often better indicators than any meter. If your plants look healthy, there's usually no need to chase EC or TDS readings.
💡 Top Tip: An EC meter tells you how much is dissolved in the water, but it can't tell you what those dissolved minerals are. Always use the correct nutrient strength, keep your pH within the ideal range, and observe your plants rather than relying on a single meter reading.
Want to learn more?
Understanding EC, TDS & Measuring Minerals in Your Reservoir →
What Is Nutrient Lock? Learn Why Plants Can't Absorb Nutrients →
Seasonal Nutrient Adjustments
As temperatures change throughout the year, your Tower Garden's nutrient needs change too. Making small seasonal adjustments can reduce plant stress and help maintain healthy growth.
☀️ Summer
Plants use water much faster during hot weather. Check the reservoir more frequently and replenish nutrients using the reduced summer strength covered earlier in this guide.
🌡️ Extreme Heat
When temperatures remain very high for extended periods, plants become stressed. Continue using reduced nutrient strength and monitor the water level daily.
🍂 Cooler Weather
As temperatures fall, plants generally grow more vigorously and consume water more slowly. Return to normal nutrient strength as conditions improve.
💧 Watch the Reservoir
No matter the season, keep an eye on the water level. The more water your plants use, the more frequently you'll need to replenish both water and nutrients.
💡 Top Tip: Your plants will tell you when seasonal adjustments are needed. During hot weather they typically grow more slowly and drink water much faster, making more frequent reservoir checks important.
Common Signs of Nutrient Problems
Your plants can often tell you when something isn't right. These symptoms may indicate too little nutrients, too much nutrients, an incorrect pH, or nutrient lock.
🌱 Leaves are Pale or Yellow
Possible cause: Incorrect pH or nutrient lockNutrients may be present in the reservoir but unavailable to the plants. Check the pH before adding more nutrients.
🍃 Brown Leaf Edges or Burnt Tips
Possible cause: Too much nutrientNutrient levels may be too high, especially during hot weather when plants often need a weaker nutrient solution.
🥬 Slow Growth
Possible cause: Nutrient imbalance, incorrect pH or nutrient lockCheck your nutrient strength, pH and whether nutrient lock may be preventing nutrient uptake.
🌿 Overall Yellowing
Possible cause: Too little nutrient or an unbalanced reservoirIf several plants begin yellowing at the same time, your reservoir may need fresh nutrients or a complete water change instead of another simple top-up.
💡 Top Tip: Don't automatically add more nutrients when plants show signs of stress. First determine whether the solution is too weak, too strong, outside the ideal pH range, or affected by nutrient lock. Adding more minerals to an already strong or unbalanced reservoir can make the problem worse. If in doubt, dump it out and refill with fresh water and the appropriate amount of nutrients.
What Is Nutrient Lock?
Nutrient lock occurs when plants are unable to properly absorb nutrients, even when nutrients are present in the water.
This can happen because of:
- Excess nutrient buildup
- Salt accumulation
- Imbalanced minerals
Nutrient lock can mimic nutrient deficiencies. Common symptoms include:
- Yellowing leaves
- Burnt tips
- Slow growth
If nutrient lock is suspected:
- Refresh the reservoir
👉 Want a deeper breakdown of what causes nutrient lock and exactly how to fix it?
Read our complete nutrient lock guide →
Common Nutrient Mistakes
Most nutrient problems aren't caused by the nutrients themselves—they're caused by how they're mixed, maintained, or monitored. Avoid these common mistakes to keep your Tower Garden growing at its best.
🧪 Using Too Much Nutrient
More isn't better. Overfeeding can stress plants, especially seedlings and gardens growing during hot weather.
Learn the Correct Mixing Rate →💧 Mixing Concentrates Together
Never combine Part A and Part B before adding them to water. Always add each concentrate separately into the reservoir.
See the Proper Mixing Method →⚖️ Ignoring pH
Even when enough nutrients are present, plants can't absorb them properly if the pH is outside the ideal range.
Read the pH Guide →🚿 Topping Off With Plain Water
Every gallon of water added should include the correct amount of nutrients. Adding only water gradually weakens your nutrient solution.
Learn How to Replenish Correctly →🔄 Never Flushing the Reservoir
Minerals slowly build up over time. Flushing the system every month or two helps prevent nutrient imbalance and keeps plants healthy.
Learn When to Flush →📈 Chasing EC & TDS Numbers
EC and TDS meters are useful tools, but healthy plants always tell the real story. Don't adjust nutrients based only on meter readings.
Learn About EC & TDS →Nutrient issues are one of the most common reasons Tower Garden plants struggle, but they're also among the easiest to fix. If your plants still aren't thriving, visit our Tower Garden Troubleshooting Hub for step-by-step solutions to common growing problems.
Tower Garden Nutrient FAQs
Find answers to the most common questions about mixing, adding and adjusting Tower Garden Mineral Blend.
How much Tower Garden nutrients should I use?
For established plants under normal growing conditions, use 20 ml of Mineral Blend A and 20 ml of Mineral Blend B per gallon of water.
New seedlings should start at half strength: 10 ml of Part A and 10 ml of Part B per gallon. During very hot weather use half strength. You may need to reduce this further to quarter strength.
Can I use other hydroponic nutrients in a Tower Garden?
Other complete hydroponic nutrients may work, but they can differ considerably in concentration, formulation and mixing instructions.
Tower Garden Mineral Blend is formulated specifically for the system and is the simplest option for most growers. Never assume another product should be used at the same dosage as Tower Garden nutrients.
How often should I add nutrients?
Add nutrients when you refill the reservoir, based on the amount of water you are replacing.
For example, if you add five gallons of water, calculate the nutrient dose for those five gallons rather than for the full reservoir. How often this is needed depends on plant size, temperature and how quickly the water level drops.
Should I use full-strength nutrients for new seedlings?
No. Begin new seedlings with half-strength nutrients: 10 ml of Part A and 10 ml of Part B per gallon of water.
Starting too strong can add unnecessary stress while seedlings are still establishing their roots. Plus, they just don't need that many minerals to start.
What happens if I accidentally add too much nutrient?
Too much nutrient can cause brown leaf tips, scorched edges, wilting or slowed growth, especially during hot weather.
If you know the reservoir is too strong, dilute it with fresh water. If a large overdose occurred, drain the reservoir and remix it at the correct strength.
Do I need to completely change the reservoir water?
Yes. Periodically draining and refilling the reservoir helps prevent imbalances caused by repeatedly topping up with water and nutrients.
As a general guide, flush and remix the reservoir every one to two months, or sooner if the water becomes dirty, develops an odor or you suspect nutrient imbalance.
Can I mix Part A and Part B together before adding them to water?
No. Never combine the concentrated Part A and Part B solutions together before adding them to water.
Add one part to the reservoir water, allow it to disperse, and then add the other. It does not matter which part you add first. Mixing the concentrates together can cause minerals to react and become unavailable to your plants.
Why are my plants yellow if I am using the correct nutrients?
Yellowing does not always mean your plants need more nutrients. Common causes include:
- pH outside the ideal 5.5–6.5 range
- Chlorine, chloramine or poor water quality
- Insufficient light
- Root problems or nutrient lock
Check these basics before increasing the nutrient strength.
What is nutrient lock?
Nutrient lock occurs when minerals are present in the water but the plants cannot absorb them properly.
It may be caused by incorrect pH, excess minerals, poor water quality or an unbalanced reservoir. Adding more nutrients can make the problem worse. Check the pH, review your water source and consider flushing and remixing the reservoir.
Should I reduce nutrients during hot weather?
Yes. Plants usually need a weaker nutrient solution during very hot weather because heat increases stress and water use.
Use half strength during summer conditions and consider quarter strength during extreme heat. Continue replenishing at the reduced rate rather than automatically returning to full strength.