Skip to main content
PetLawn & GardenTruck & AutomotiveClothingPoultryHeating & CoolingHorseSporting GoodsOutdoor Power EquipmentFencing & GatesLivestockOutdoor LivingPet & Animal PharmacyToolsHome ImprovementFarm & RanchBoots & ShoesTrailers & TowingHome Decor & FurnitureWild Birds & WildlifeToysGift CardsServices Propane RefillTrailer RentalGarden CenterFeed CenterSame Day DeliveryPetVet ClinicPet WashGrooming at PetsenseDog Training at PetsenseTractor Supply RxPet InsuranceWag!

"Savings and Offers"

Weekly AdSaleClearance

"More Options"

Weekly AdWhat's NewTractor Supply AppEarn Rewards with Neighbor's ClubHometown HeroesLife Out Here BlogTSC Exclusive BrandsTop BrandsClearance ItemsBattery FinderOutdoor Power Equipment Parts FinderHitch Finder

Spend $49.99 to unlock Free Delivery on most orders

|
Learn More
Order statusTSC Credit CardsWhat’s newPetsenseWeekly Ad
​

Sign In / Enroll

Get rewarded!

​
Menu

Search

Home

Sign In

Cart
0.0
(0)
0.0 out of 5 stars.
A woman outside with a dog
A woman outside with a dog
  1. Home
  2. /
  3. Lawn & Garden
  4. /
  5. Plant Care & Fertilizer
  6. /
  7. Fertilizers
  8. /

  9. Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

  1. Home
  2. /
  4. /
  5. Fertilizers

Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

Shop all Power Si
Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

Item # 604262099

Power Si Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
Power Si Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
$75.99

Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Shop all Power Si
Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

Item # 604262099

Power Si Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
Power Si Power Si 8.45 oz. (250ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

$75.99
financeCard Logo
New Cardmembers earn a $20 Reward‡ with qualifying purchase of $20 or more plus earn 5% in Rewards+ on this purchase. Valid through 8/9/26.

This item is available online only

Delivery to

Free standard delivery on online footwear & Clothing purchases of $49 and over.

​
Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Power Si Original 250ml is a premium, concentrated silicic acid formula designed to improve nutrient uptake, build stronger plants, and boost overall crop health. This compact size is perfect for home growers or those new to using silica-based nutrients. Formulated with bioavailable silica, boron, and molybdenum, Power Si strengthens stems and roots, supports faster growth, and helps plants resist stress from pests, drought, and nutrient imbalances. It also helps reduce salt buildup and keeps plants hydrated. Safe for all crop types and grow methods. Power Si is fully tank-stable, pH-neutral, and compatible with any nutrient program. How to Use: Mix 0.5 mL per gallon of water.

Looking for more information on fertilizer? Check out our guide on how to read fertilizer numbers in the product documents section.

  • Compact Size, Powerful Results 250ml bottle ideal for small grow setups, test grows, or home gardeners. Highly concentrated formula with visible results.
  • Boosts Nutrient Uptake Helps your plants absorb and use nutrients more efficiently, improving overall health, strength, and growth.
  • Supports Stronger Stems & Roots Strengthens cell walls and encourages better root development to improve plant structure and stress resistance.
  • Reduces Salt Buildup & Dehydration Keeps plants hydrated and healthy by minimizing salt buildup and reducing moisture loss from leaves.
  • Easy to Mix & Fully Compatible Mixes easily into any grow system and works with all fertilizers, boosters, and plant protection products without affecting pH.
BrandPower Si
Country of OriginMade in USA
Application MethodPour
Compatible Grass TypesAll Purpose
Compatible SeasonsAll-season
Concentrated or Ready to UseConcentrated
Contact Or SystemicN/A
Coverage Area7,500 sq ft
EmergenceN/A
Fertilizer Coverage Area Range6000 - 9999 sq ft
Fertilizer FeaturesN/A
Fertilizer Longevity10 days
Fertilizer NPK RatioN/A
Fertilizer Pack Size RangeLess than 15lb
FormLiquid
OrganicNo
Package Quantity1
Package Size8.45 oz.
Product Height5.3 in.
Product Length2.4 in.
Product Weight0.7 lb.
Product Width2.4 in.
WarningsYes
Manufacturer Part Number20579
No questions have been asked about this product.

No questions have been asked about this product.

Q&As

No questions have been asked about this product.

No questions have been asked about this product.

Similar Items

  1. Power Si 1.32 gal. (5L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 1.32 gal. (5L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

    $999.99
  2. Power Si 16.91 oz. (500ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 16.91 oz. (500ml) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

    $120.99
  3. Power Si 33.81 oz. (1L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 33.81 oz. (1L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

    $219.99
  4. Power Si 5.28 gal. (20L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 5.28 gal. (20L) Original Liquid Plant Fertilizer with Silica Biomix 1-3-1, 1 pk.

    $2,899.99
  5. Power Si 8.45 oz. (250ml) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 8.45 oz. (250ml) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.

    $32.99
  6. Power Si 0.55 lb. (250ml) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.
    4.0 out of 5 stars with 2 reviews
    4.0 (2)

    Power Si 0.55 lb. (250ml) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.

    $45.99
  7. Power Si 44 lb. (20L) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 44 lb. (20L) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.

    $1,799.99
  8. Power Si 2.2 lb. (1L) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 2.2 lb. (1L) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.

    $130.99
  9. Power Si 1.1 lb. (500ml) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 1.1 lb. (500ml) Bloom Liquid Plant Fertilizer Flowering Plants, 1 pk.

    $75.99
  10. Power Si 4.41 lb. (2kg) Granular Dry Plant Fertilizer with Extended-Release Silica 0.9-0.8-0.8, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 4.41 lb. (2kg) Granular Dry Plant Fertilizer with Extended-Release Silica 0.9-0.8-0.8, 1 pk.

    $89.99
  11. Power Si PowerSi 0.26 gal. (1L) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si PowerSi 0.26 gal. (1L) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.

    $99.99
  12. Power Si 16.91 oz.(500ml) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 16.91 oz.(500ml) PK Synergy Liquid Plant Fertilizer Bloom Phase Microbial Inoculant, 1 pk.

    $59.99

Items You May Like

  1. Power Si 5 lb. (2.27kg) Power Start Dry Plant Supplement with Mycorrhizae and Nitrogen-Fixing Bacteria, 1 pk.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Power Si 5 lb. (2.27kg) Power Start Dry Plant Supplement with Mycorrhizae and Nitrogen-Fixing Bacteria, 1 pk.

    $419.99
  2. Seedlingers Worm Magic Worm Castings 1 lb. Granular
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Worm Magic Worm Castings 1 lb. Granular

    $9.99
  3. The Harvest Company 5 ft. x 60 ft. Soft. Polyester Trellis Netting, 6 in. Mesh Squares (1-Pack)
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    The Harvest Company 5 ft. x 60 ft. Soft. Polyester Trellis Netting, 6 in. Mesh Squares (1-Pack)

    $19.99
  4. Top Rated
    GreenView 33 lb. 13-13-13 NPK Multi-Purpose Fertilizer
    5.0 out of 5 stars with 2 reviews
    5.0 (2)

    GreenView 33 lb. 13-13-13 NPK Multi-Purpose Fertilizer

    $41.99
  5. Seedlingers Tomato Food 16 oz. Concentrate
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Tomato Food 16 oz. Concentrate

    $11.99
  6. Scotts Lawn Pro Lawn Fertilizer 15M
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Scotts Lawn Pro Lawn Fertilizer 15M

    $59.99
  7. SAPROTERRA All Purpose Organic Liquid Fertilizer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    SAPROTERRA All Purpose Organic Liquid Fertilizer

    $16.99
  8. Top Rated
    GroundWork 15-5-10 Texas Fertilizer 30LB
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    GroundWork 15-5-10 Texas Fertilizer 30LB

    $29.99
  9. Top Rated
    Espoma 8 lb. 100 sq. ft. Plant-Tone
    5.0 out of 5 stars with 14 reviews
    5.0 (14)

    Espoma 8 lb. 100 sq. ft. Plant-Tone

    $14.99
  10. Seedlingers Tomato Food 32 oz. Concentrate
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Tomato Food 32 oz. Concentrate

    $17.99
  11. GreenView Solutions Starter Fertilizer 10-18-10 16 lb.
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    GreenView Solutions Starter Fertilizer 10-18-10 16 lb.

    $32.99
  12. Top Rated
    GreenView Solutions Natural Base Fertilizer 15-0-7
    5.0 out of 5 stars with 6 reviews
    5.0 (6)

    GreenView Solutions Natural Base Fertilizer 15-0-7

    $69.99

Customers Also Bought

  1. Seedlingers Sprinklets Plant Food 1 lb. Granular
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Sprinklets Plant Food 1 lb. Granular

    $12.99
  2. Gordon's 1 gal. 6,000 sq. ft. Triple 10 Liquid Fertilizer 10-10-10
    3.6 out of 5 stars with 17 reviews
    3.6 (17)

    Gordon's 1 gal. 6,000 sq. ft. Triple 10 Liquid Fertilizer 10-10-10

    $32.99
  3. GreenView Starter Fertilizer 10-18-10
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    GreenView Starter Fertilizer 10-18-10

    $79.99
  4. Seedlingers Mix & Feed All Purpose Plant Food 2.5 Gallon Concentrate
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Mix & Feed All Purpose Plant Food 2.5 Gallon Concentrate

    $154.99
  5. Seedlingers Tomato Food 128 oz. Concentrate
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Tomato Food 128 oz. Concentrate

    $64.99
  6. Seedlingers Sprinklets Plant Food 10 lb. Granular
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Seedlingers Sprinklets Plant Food 10 lb. Granular

    $64.99
  7. Just Scentsational 5 gal. Trident's Pride Liquid Fish Fertilizer
    4.0 out of 5 stars with 15 reviews
    4.0 (15)

    Just Scentsational 5 gal. Trident's Pride Liquid Fish Fertilizer

    $124.99
  8. Woodace 40 lb. Flowering Plant Special Fertilizer 14-14-14
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Woodace 40 lb. Flowering Plant Special Fertilizer 14-14-14

    $79.99
  9. Top Rated
    Woodace 18-5-10 Long Term Plant Fertilizer Bag, 40 lb.
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    Woodace 18-5-10 Long Term Plant Fertilizer Bag, 40 lb.

    $59.99
  10. Milorganite 32 lb. 2,500 sq. ft. Fertilizer
    4.7 out of 5 stars with 456 reviews
    4.7 (456)

    Milorganite 32 lb. 2,500 sq. ft. Fertilizer

    $24.99
  11. NutriPod Precise Plant Nutrition for Palms
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    NutriPod Precise Plant Nutrition for Palms

    $14.99
  12. Priority Products GroStik Plant and Soil Energizer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Priority Products GroStik Plant and Soil Energizer

    $34.99

Reviews

Review this Product

Select to rate the item with 1 star. This action will open submission form.
Select to rate the item with 2 stars. This action will open submission form.
Select to rate the item with 3 stars. This action will open submission form.
Select to rate the item with 4 stars. This action will open submission form.
Select to rate the item with 5 stars. This action will open submission form.
Be the first to review this product
Get the top deals, latest trends and more
Sign up for emails from Tractor Supply today.
First Name*
Last Name*
Email*

Customer Support

  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  

    (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

About Us

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

Work With Us

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

Neighbor's Club

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

Credit Center

  • TSC Credit Card

  • Klarna

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More
  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

  • TSC Credit Card

  • Klarna

Connect & Share with the Tractor Supply Community.

Shop on the go with the Tractor Supply App

Learn More
  • Privacy policy
  • Your Privacy Choices
  • Terms and Conditions
  • California Transparency Act
  • Legal Notices
  • Accessibility
  • Responsible Disclosure Statement
  • Surprise (Balance) Medical Billing Disclosure
  • Transparency in Coverage
  • Human Rights Policy
  • Vendor Code of Conduct
  • California Notice of Collection
  • Privacy Requests

© 2026, Tractor Supply Co. All Rights Reserved.