•
1 2
Grotek CA flag

Official Reseller

Provision Gardens is an official reseller of this brand.

Our inventory is sourced directly from the manufacturer and/or authorized distribution partners. We do not sell used items or unverified/old stock. This helps ensure product authenticity, freshness, and the high standard you expect.

Grotek Black Pearl - 4 Litre

Vegetative Stage Flowering Stage Indoor Outdoor Regular Watering Coco Coir Safe Soil Soilless Organic

Grotek Black Pearl - 4 Litre

$65.52
$65.52
Shipping calculated at checkout.

OTHER AVAILABLE SIZES / MODELS:

4 Litre 900 ML
Store Availability
Winnipeg, Manitoba
Available
Barrie, Ontario
Unavailable
Newmarket, Ontario
Unavailable
Pickering, Ontario
Unavailable

Out of stock at your chosen pickup location? We'll automatically transfer inventory from another location so it's ready at your selected pickup location. (Ontario Only)
Not Eligible for Free Shipping

Description

Grotek Black Pearl is a biochar soil conditioner for improving soil quality and supporting root development in soil and soilless media. It works as a soil builder and soil amendment focused on strengthening the root zone and the growing medium itself, not as a stand-alone base fertilizer.

Black Pearl is built around a premium biochar foundation that helps create more stable conditions in the medium over time. This soil and soilless media conditioner is designed to support beneficial soil biology while promoting biodiversity and biological activity around the roots. By helping improve nutrient cycling, it supports a more efficient root environment where plants can develop with fewer ups and downs tied to media quality. Black Pearl also helps improve moisture holding capacity, supporting steadier hydration in the root zone.

This highly charged biochar blend combines biochar with volcanic rock dust, low molecular weight humates, and kelp. Together, these inputs contribute to a mineral-rich conditioning profile that provides key minerals for plant development while supporting a healthy, active rhizosphere. The volcanic rock dust and kelp contribute a broad mineral and organic input profile, while the low molecular weight humates support a more functional root-zone environment.

Black Pearl is a practical choice when the goal is to improve overall soil quality rather than chase short-term results. It’s well suited to conditioning new mixes, refreshing soilless blends, and supporting consistent performance from media that needs rebuilding. Because it’s positioned as a soil conditioner, it fits growers who care about structure, biology, and long-term media performance, with benefits that show up through stronger root development and more resilient plant growth.

This is a good fit for growers using soil and soilless media who want a biochar-based soil builder that promotes biodiversity and biological activity while helping improve nutrient cycling and moisture holding capacity.

Guaranteed Minimum Analysis
Soluble Potash (K2O) 1.0%
Calcium (Ca) 1.0%

Derived From
Biochar
Volcanic Ash Deposit
Kelp Extract
Low Molecular Weight Humates

Frequently Asked Questions
What does biochar actually do in soil for plant growth?

Biochar acts like a long-lasting storage and habitat material in the root zone, helping soil hold water and nutrients more evenly while keeping better airflow for roots. It’s important because it can make plants more resilient to watering and feeding swings, and it’s unique because it’s not a fertilizer or compost substitute, but a stable, porous carbon structure that buffers the whole soil environment over time.

Read the full guide

Why is calcium important for plant growth?

Calcium is important because it builds and stabilizes plant cells as they form, acting as the structural support that keeps new growth strong and functional. Unlike other nutrients that drive color or speed of growth, calcium’s role is unique because it controls cell wall strength and membrane stability, making it essential for healthy roots, shoots, and long-term plant resilience rather than quick visual results.

Read the full guide

Why is soluble potash (K2O) important for plants?

Soluble potash (K2O) is important because it helps plants control water use, move sugars to new growth and fruit, and build stronger, higher-quality structure under stress. It’s unique from many other nutrients because it acts more like a regulator and transport helper than a direct “building material,” so the biggest benefits show up as steadier growth, stronger stems, and better finishing instead of just bigger leaves.

Read the full guide

What does kelp extract actually do for plant growth?

Kelp extract supports plant growth by acting as a biostimulant that helps roots stay active, improves stress tolerance, and encourages steadier new growth without functioning like a heavy fertilizer. It’s unique because it influences plant processes and recovery more than it supplies major nutrients, so it works best as supportive “management help” rather than a direct N-P-K replacement.

Read the full guide

What do low molecular weight humates do differently in the root zone compared to other humates?

Low molecular weight humates dissolve and move through the root zone more easily, so they can help nutrients stay available right where feeder roots absorb them, especially micronutrients that often get tied up. That mobility makes them unique because they support faster, more consistent uptake efficiency rather than mainly long-term soil structure effects.

Read the full guide

Is volcanic ash a fertilizer or a soil mineral amendment?

Volcanic ash is best thought of as a slow mineral amendment, not a fast fertilizer, because it releases a broad range of mineral elements gradually as it weathers in the root zone. Its unique value is long-term mineral balance and resilience rather than quick growth, which is why it helps prevent vague trace-mineral imbalances more than it fixes sudden deficiencies.

Read the full guide

View full details

Product Comparison