Aptus Massboost Cal-Mag & Sulfur Bud Development Supplement
Official Distributor
An Important Note on Pricing and Returns:
We believe in upfront pricing and fair policies—no hidden fees, no surprises, and easy,
transparent returns. If you're comparing options, we encourage you to review competitors’ fine
print carefully.
We've helped countless customers who had issues elsewhere, and we’re here to make sure that never
happens to you.
Free Shipping
On most orders
Call Us
(833) 416-0375
Mon-Fri 9am-6pm CST
Best price, guaranteed
Contact us to unlock it
Easy Returns
Always hassle free
Free Shipping
Exclusions apply
Lowest Price Gurantee
Easy Returns
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.
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!!
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
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.
Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.
FAQ Section
Specifications 
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.
Weight
Brand
Available Sizes
