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FAQ Section

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What is Aptus MassBoost used for? \n
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MassBoost is used to prevent calcium and magnesium deficiencies while enhancing fruit set and flower development during flowering.
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When should I apply MassBoost? \n
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Apply during flowering weeks 3, 5, and 7. It can also be used in the vegetative phase if calcium or magnesium deficiencies appear.
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What is the recommended dosage? \n
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Use 5–10 ml per 5 gallons during flowering, and 2.5–5 ml per 5 gallons during vegetative growth if needed.
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Which growing mediums can MassBoost be used in? \n
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MassBoost is suitable for soil, coco coir, and hydroponic systems.
\n
\n
\n
Does MassBoost replace a Cal-Mag supplement? \n
\n
It provides targeted calcium and magnesium support but is intended as a booster, not a complete base nutrient replacement.
\n
\n
\n
What sizes is Aptus MassBoost available in? \n
\n
Aptus MassBoost is available in 1L, 5L, and 20L sizes.
\n
\n
\n
Is MassBoost safe to use with other Aptus products? \n
\n
Yes, MassBoost is designed to integrate seamlessly with the full Aptus nutrient line.
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Specifications \"\"\n

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Aptus MassBoost\"\"
SKUAP16010
Available Sizes1L, 5L, 20L
NPK (Nitrogen)5
Application PhaseFlowering (Weeks 3, 5, 7), Vegetative (if needed)
Growing MediaSoil, Coco, Hydroponics
Shipping Weight (1L)3.3 lbs
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What is included? \"\"\n

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It includes:

\n
\n
    \n
  • \n\"\" Aptus MassBoost (Selected Size: 1L, 5L, or 20L)\n
    • \n
  • \n\"\" Original Manufacturer-Sealed Container\n
    • \n
  • \n\"\" Usage and Application Instructions\n
    • \n
\n
\n
\n
\"\"
\n
\n
\n
\n
\n

Warranty Policy

\n

Please check out the manufcaturers website for Warranty related issues.

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Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement
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Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement

Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement

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From $38.48

Original: $109.95

-65%
Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement—

$109.95

$38.48

The Story

Aptus MassBoost

Aptus MassBoost is a targeted flowering booster designed to prevent calcium and magnesium deficiencies while enhancing fruit set, flower density, and structural strength. Applied during key bloom weeks, it supplies essential Ca and Mg when plants need them most, supporting strong cell walls, efficient photosynthesis, and healthy development in soil, coco, and hydroponic growing systems.

  • Features & Benefits
  • Product Specifications
  • What is included?
  • Warranty Policy

Targeted Calcium & Magnesium Flowering Booster

MassBoost delivers precisely timed calcium and magnesium supplementation during critical flowering stages, helping plants maintain structural integrity, optimize photosynthesis, and maximize flower development without disrupting your base nutrient program.

  • Prevents calcium and magnesium deficiencies
  • Enhances fruit set and flower development
  • Strengthens cell walls, stems, and flowers
  • Supports chlorophyll production and photosynthesis
  • Designed for use in weeks 3, 5, and 7 of flowering
  • Compatible with soil, coco, and hydro systems

Stronger Flowers When It Matters Most

Aptus MassBoost ensures your plants receive critical calcium and magnesium exactly when demand is highest. By reinforcing plant structure and boosting photosynthetic efficiency, it helps growers achieve denser, heavier flowers and consistent performance during intensive flowering stages.

Why Aptus?

Aptus is trusted by professional growers worldwide for its science-driven formulations, premium raw materials, and uncompromising quality. Each product is designed to deliver maximum efficiency with minimal input, helping growers achieve consistent, high-quality results through precision nutrition.

Why Buy From Us?

At GreenThumbDepot, you're not just another sale to a faceless corporation. You're partnering with a team genuinely invested in your success. Our legendary customer service, combined with a promise of unbeatable prices, sets us apart. We're here for you, always.

Excellent 4.8 out of 5 based on 1,247 reviews
If I could rate 6 stars I would!
If I could rate 6 stars I would! My representative Edouard B. has been shockingly responsive! Like - oh my god - an actual SERVICE oriented company. He's dug into my odd connectivity issues I've been having - and following up in an AMAZINGLY timey manner. No shit. You'll be impressed! (And the price was also unbeatable, quick shipping...it's all PERFECT). Thank you Ed!!
Reviewer
Jim D

Customer service was outstanding great…
Customer service was outstanding great people to deal with they understand your needs and they will do their best to fulfill them there is no way I can complain about them because they are the best help out there.Thanks green thumb depot. I'll definitely order from them again
Reviewer
Glenn Appleton

The machine is doing just what my…
The machine is doing just what my salesman told it would do (I appreciate you Ed thank you) . The machine is what we need for our new business we're starting up, soon to be llc and licensed. We are getting a lot of clients wanting our services. Ed I will be needing more of your products, thank you again.
Reviewer
Freddie

Fantastic
Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.
Reviewer
Kar

←
→

FAQ Section

What is Aptus MassBoost used for?
MassBoost is used to prevent calcium and magnesium deficiencies while enhancing fruit set and flower development during flowering.
When should I apply MassBoost?
Apply during flowering weeks 3, 5, and 7. It can also be used in the vegetative phase if calcium or magnesium deficiencies appear.
What is the recommended dosage?
Use 5–10 ml per 5 gallons during flowering, and 2.5–5 ml per 5 gallons during vegetative growth if needed.
Which growing mediums can MassBoost be used in?
MassBoost is suitable for soil, coco coir, and hydroponic systems.
Does MassBoost replace a Cal-Mag supplement?
It provides targeted calcium and magnesium support but is intended as a booster, not a complete base nutrient replacement.
What sizes is Aptus MassBoost available in?
Aptus MassBoost is available in 1L, 5L, and 20L sizes.
Is MassBoost safe to use with other Aptus products?
Yes, MassBoost is designed to integrate seamlessly with the full Aptus nutrient line.

Specifications

Aptus MassBoost
SKU AP16010
Available Sizes 1L, 5L, 20L
NPK (Nitrogen) 5
Application Phase Flowering (Weeks 3, 5, 7), Vegetative (if needed)
Growing Media Soil, Coco, Hydroponics
Shipping Weight (1L) 3.3 lbs

What is included?

It includes:

  • Aptus MassBoost (Selected Size: 1L, 5L, or 20L)
  • Original Manufacturer-Sealed Container
  • Usage and Application Instructions

Warranty Policy

Please check out the manufcaturers website for Warranty related issues.

Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement - Image 2

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement - Image 3

Details & Craftsmanship

Every detail has been carefully considered to bring you the perfect product.

Description

Aptus MassBoost

Aptus MassBoost is a targeted flowering booster designed to prevent calcium and magnesium deficiencies while enhancing fruit set, flower density, and structural strength. Applied during key bloom weeks, it supplies essential Ca and Mg when plants need them most, supporting strong cell walls, efficient photosynthesis, and healthy development in soil, coco, and hydroponic growing systems.

  • Features & Benefits
  • Product Specifications
  • What is included?
  • Warranty Policy

Targeted Calcium & Magnesium Flowering Booster

MassBoost delivers precisely timed calcium and magnesium supplementation during critical flowering stages, helping plants maintain structural integrity, optimize photosynthesis, and maximize flower development without disrupting your base nutrient program.

  • Prevents calcium and magnesium deficiencies
  • Enhances fruit set and flower development
  • Strengthens cell walls, stems, and flowers
  • Supports chlorophyll production and photosynthesis
  • Designed for use in weeks 3, 5, and 7 of flowering
  • Compatible with soil, coco, and hydro systems

Stronger Flowers When It Matters Most

Aptus MassBoost ensures your plants receive critical calcium and magnesium exactly when demand is highest. By reinforcing plant structure and boosting photosynthetic efficiency, it helps growers achieve denser, heavier flowers and consistent performance during intensive flowering stages.

Why Aptus?

Aptus is trusted by professional growers worldwide for its science-driven formulations, premium raw materials, and uncompromising quality. Each product is designed to deliver maximum efficiency with minimal input, helping growers achieve consistent, high-quality results through precision nutrition.

Why Buy From Us?

At GreenThumbDepot, you're not just another sale to a faceless corporation. You're partnering with a team genuinely invested in your success. Our legendary customer service, combined with a promise of unbeatable prices, sets us apart. We're here for you, always.

Excellent 4.8 out of 5 based on 1,247 reviews
If I could rate 6 stars I would!
If I could rate 6 stars I would! My representative Edouard B. has been shockingly responsive! Like - oh my god - an actual SERVICE oriented company. He's dug into my odd connectivity issues I've been having - and following up in an AMAZINGLY timey manner. No shit. You'll be impressed! (And the price was also unbeatable, quick shipping...it's all PERFECT). Thank you Ed!!
Reviewer
Jim D

Customer service was outstanding great…
Customer service was outstanding great people to deal with they understand your needs and they will do their best to fulfill them there is no way I can complain about them because they are the best help out there.Thanks green thumb depot. I'll definitely order from them again
Reviewer
Glenn Appleton

The machine is doing just what my…
The machine is doing just what my salesman told it would do (I appreciate you Ed thank you) . The machine is what we need for our new business we're starting up, soon to be llc and licensed. We are getting a lot of clients wanting our services. Ed I will be needing more of your products, thank you again.
Reviewer
Freddie

Fantastic
Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.
Reviewer
Kar

←
→

FAQ Section

What is Aptus MassBoost used for?
MassBoost is used to prevent calcium and magnesium deficiencies while enhancing fruit set and flower development during flowering.
When should I apply MassBoost?
Apply during flowering weeks 3, 5, and 7. It can also be used in the vegetative phase if calcium or magnesium deficiencies appear.
What is the recommended dosage?
Use 5–10 ml per 5 gallons during flowering, and 2.5–5 ml per 5 gallons during vegetative growth if needed.
Which growing mediums can MassBoost be used in?
MassBoost is suitable for soil, coco coir, and hydroponic systems.
Does MassBoost replace a Cal-Mag supplement?
It provides targeted calcium and magnesium support but is intended as a booster, not a complete base nutrient replacement.
What sizes is Aptus MassBoost available in?
Aptus MassBoost is available in 1L, 5L, and 20L sizes.
Is MassBoost safe to use with other Aptus products?
Yes, MassBoost is designed to integrate seamlessly with the full Aptus nutrient line.

Specifications

Aptus MassBoost
SKU AP16010
Available Sizes 1L, 5L, 20L
NPK (Nitrogen) 5
Application Phase Flowering (Weeks 3, 5, 7), Vegetative (if needed)
Growing Media Soil, Coco, Hydroponics
Shipping Weight (1L) 3.3 lbs

What is included?

It includes:

  • Aptus MassBoost (Selected Size: 1L, 5L, or 20L)
  • Original Manufacturer-Sealed Container
  • Usage and Application Instructions

Warranty Policy

Please check out the manufcaturers website for Warranty related issues.

Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement | Green Thumb Depot