🚀 We’re in Beta!

Meet our new design. Everything works as usual, but if anything feels off, give us a ping.

Your One-Stop Destination for Humboldts Secret

Indulge in iconic and innovative Humboldts Secret items curated just for you.

Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

4.6
$1,294
Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 32 Ounces

Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 32 Ounces

4.6
$288
Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 1 Gallon

Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 1 Gallon

4.5
$1,239
The White Apron: A Compilation of the History of Occidental Lodge, No. 40, A. F. and A. M., Ottawa, Illinois, with a Complete List of Members from the ... of Her Daughter, Humboldt Lodge, No. 555,

The White Apron: A Compilation of the History of Occidental Lodge, No. 40, A. F. and A. M., Ottawa, Illinois, with a Complete List of Members from the ... of Her Daughter, Humboldt Lodge, No. 555,

$52
Humboldts SecretEverything Outdoor Plant Food - 5-5-5 Liquid Fertilizer with Kelp - All Purpose Plant, Vegetable, Fruit Tree and Lawn Fertilizer (1 Gallon Refill)…

Humboldts SecretEverything Outdoor Plant Food - 5-5-5 Liquid Fertilizer with Kelp - All Purpose Plant, Vegetable, Fruit Tree and Lawn Fertilizer (1 Gallon Refill)…

$168
Humboldts Secret 0-52-34 Monopotassium Phosphate Fertilizer | Bloom Booster MKP Fertilizer, Increase Blooming & Yield | High Purity Water Soluble Fertilizer | 2lb

Humboldts Secret 0-52-34 Monopotassium Phosphate Fertilizer | Bloom Booster MKP Fertilizer, Increase Blooming & Yield | High Purity Water Soluble Fertilizer | 2lb

4.9
$445
Secret Clinical Strength Invisible Solid Women's Antiperspirant & Deodorant Completely Clean Scent, 1.6 Fluid Ounce by Secret

Secret Clinical Strength Invisible Solid Women's Antiperspirant & Deodorant Completely Clean Scent, 1.6 Fluid Ounce by Secret

4.4
$232
Humboldts Secret Sweet & Sticky (1 Gallon)

Humboldts Secret Sweet & Sticky (1 Gallon)

4.6
$1,729
Humboldts Secret pH Up - Hydroponic pH Up - pH Up for Plants to Stabilize Nutrient - Plant pH Adjustment - Plant Nutrient pH Levels Optimizer (32 Ounce)

Humboldts Secret pH Up - Hydroponic pH Up - pH Up for Plants to Stabilize Nutrient - Plant pH Adjustment - Plant Nutrient pH Levels Optimizer (32 Ounce)

3.5
$415
Humboldts Secret Starter Kit - World's Best Nutrient System: Base A & B, Golden Tree, Flower Stacker, Plant Enzymes and CalMag & Iron

Humboldts Secret Starter Kit - World's Best Nutrient System: Base A & B, Golden Tree, Flower Stacker, Plant Enzymes and CalMag & Iron

4.6
FREE
Humboldts SecretSweet & Sticky (32 Ounce)

Humboldts SecretSweet & Sticky (32 Ounce)

4.6
$969
PASEO POR LA MESETA Y LOS VOLCANES.: Diario secreto de Humboldt en España.

PASEO POR LA MESETA Y LOS VOLCANES.: Diario secreto de Humboldt en España.

$95
Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (8 oz) w/Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food (8 oz)

Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (8 oz) w/Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food (8 oz)

$449
Humboldts Secret62% Humidity Packs RH 2-Way | Moisture Absorber & Regulator for Small Containers | Relative Humidity Control Packets with Resealable Bag | 2 Way Humidity Control Packs | Pack of 10

Humboldts Secret62% Humidity Packs RH 2-Way | Moisture Absorber & Regulator for Small Containers | Relative Humidity Control Packets with Resealable Bag | 2 Way Humidity Control Packs | Pack of 10

$50
Humboldts SecretPlant Enzymes – Best Plant and Root Enzymes – 7000 Active Units of Enzyme per ML (2 oz) w/Golden Tree – All-in-One Concentrated Additive – Vegetables, Flowers, & More (2 oz)

Humboldts SecretPlant Enzymes – Best Plant and Root Enzymes – 7000 Active Units of Enzyme per ML (2 oz) w/Golden Tree – All-in-One Concentrated Additive – Vegetables, Flowers, & More (2 oz)

$96
Microbe Life Hydroponics PH21402 Premium pH Down, 16 Ounce

Microbe Life Hydroponics PH21402 Premium pH Down, 16 Ounce

3.8
$216
Humboldts SecretStarter Kit 2 - Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B - Golden Tree - Flower Stacker - Plant Enzymes - CalMag & Iron - Sweet & Sticky - Tree Trunk

Humboldts SecretStarter Kit 2 - Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B - Golden Tree - Flower Stacker - Plant Enzymes - CalMag & Iron - Sweet & Sticky - Tree Trunk

4.3
$1,449
Humboldt Haberdashery Sinamay Teardrop Fascinator Hat Base for Millinery 5 1/2" x 4"

Humboldt Haberdashery Sinamay Teardrop Fascinator Hat Base for Millinery 5 1/2" x 4"

$46
Humboldts Secret 62% Humidity Packs RH 2-Way | Moisture Absorber & Regulator for Small Containers | Relative Humidity Control Packets with Resealable Bag | 2 Way Humidity Control Packs | Pack of 10

Humboldts Secret 62% Humidity Packs RH 2-Way | Moisture Absorber & Regulator for Small Containers | Relative Humidity Control Packets with Resealable Bag | 2 Way Humidity Control Packs | Pack of 10

$56
Safer GroSG9920QT Ph Down Lowers Water

Safer GroSG9920QT Ph Down Lowers Water

4.4
$599
Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System

Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System

4.6
$347
Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron

4.6
$959
Humboldts Secret Everything Indoor Plant Food with Kelp | Liquid Concentrate Indoor Plant Fertilizer 3-3-3 All Purpose Plant Food for House Plants (8 Ounce)

Humboldts Secret Everything Indoor Plant Food with Kelp | Liquid Concentrate Indoor Plant Fertilizer 3-3-3 All Purpose Plant Food for House Plants (8 Ounce)

$50
Humboldts Secret Fabric Grow Bags - Non Woven Fabric Plant Pots - Reusable Garden Bags - Plant Grow Bags for Indoor and Outdoor Plants - Thick Fabric Pots with Handles (5-Pack) (7 Gallon)

Humboldts Secret Fabric Grow Bags - Non Woven Fabric Plant Pots - Reusable Garden Bags - Plant Grow Bags for Indoor and Outdoor Plants - Thick Fabric Pots with Handles (5-Pack) (7 Gallon)

$201
PASEO POR LA MESETA Y LOS VOLCANES.: Diario secreto de Humboldt en España.

PASEO POR LA MESETA Y LOS VOLCANES.: Diario secreto de Humboldt en España.

FREE
Humboldts SecretClip On LED Grow Light for Indoor Plants Full Spectrum w/Warm, White, & UV-IR Lights | 200W Intensity & Timer | for Tables, Desks, & More | Plant Light for Indoor Plants, Herbs, Etc

Humboldts SecretClip On LED Grow Light for Indoor Plants Full Spectrum w/Warm, White, & UV-IR Lights | 200W Intensity & Timer | for Tables, Desks, & More | Plant Light for Indoor Plants, Herbs, Etc

4.4
$114
Humboldts SecretPlant Enzymes – Best Plant and Root Enzymes – 7000 Active Units of Enzyme per ML (16 oz) w/Golden Tree – All-in-One Concentrated Additive – Vegetables, Flowers, & More (16 oz)

Humboldts SecretPlant Enzymes – Best Plant and Root Enzymes – 7000 Active Units of Enzyme per ML (16 oz) w/Golden Tree – All-in-One Concentrated Additive – Vegetables, Flowers, & More (16 oz)

$351
Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8 oz Set) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8 oz Set) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$163
Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$141
Humboldts SecretGolden Tree - All-in-One Concentrated Additive - Vegetables, Flowers, Fruits, & More (2 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz)

Humboldts SecretGolden Tree - All-in-One Concentrated Additive - Vegetables, Flowers, Fruits, & More (2 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz)

$461
Humboldts Secret A & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32oz Set) w/ 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles (32oz)

Humboldts Secret A & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32oz Set) w/ 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles (32oz)

$208
Humboldts SecretFlower Stacker Nutrient System for Indoor & Outdoor Plants (32oz) w/Everything Kit NPK with Kelp (Everything Indoor, Everything Outdoor, and Everything Growing)

Humboldts SecretFlower Stacker Nutrient System for Indoor & Outdoor Plants (32oz) w/Everything Kit NPK with Kelp (Everything Indoor, Everything Outdoor, and Everything Growing)

$909
Humboldts SecretHumboldts Secret Everything Growing Plant Food 20-20-20 Plant Fertilizer - Balanced Blend of Nitrogen, Phosphorus, Potassium, and Kelp - for Lawns, Gardens, Fruit Trees and House Plants (10 lb)

Humboldts SecretHumboldts Secret Everything Growing Plant Food 20-20-20 Plant Fertilizer - Balanced Blend of Nitrogen, Phosphorus, Potassium, and Kelp - for Lawns, Gardens, Fruit Trees and House Plants (10 lb)

4.3
$385
Humboldts SecretFlower Stacker Nutrient System for Potting Soil for Indoor & Outdoor Plants (32 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretFlower Stacker Nutrient System for Potting Soil for Indoor & Outdoor Plants (32 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$179
Humboldts SecretGolden Tree - All-in-One Concentrated Additive - Vegetables, Flowers, Fruits, & More (16 oz) w/A & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (1 Gallon Se

Humboldts SecretGolden Tree - All-in-One Concentrated Additive - Vegetables, Flowers, Fruits, & More (16 oz) w/A & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (1 Gallon Se

$479
Humboldts Secret 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles for Concentrated Lawn Fertilizer | Use for Lawn Care, Car Wash, Garden Sprayer, Lawn Sprayer, etc. | (32oz)

Humboldts Secret 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles for Concentrated Lawn Fertilizer | Use for Lawn Care, Car Wash, Garden Sprayer, Lawn Sprayer, etc. | (32oz)

4.3
$84
Humboldts SecretFlower Stacker Nutrient System for Potting Soil for Indoor & Outdoor Plants (8 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretFlower Stacker Nutrient System for Potting Soil for Indoor & Outdoor Plants (8 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$141
Humboldts SecretIndoor LED Grow Room Glasses | Grow Light Glasses LED Protection From Full Spectrum, Red/Blue, & Yellow Lights | Interchangeable Magnetic Sunglasses With UVA/UVB Blocking Protection

Humboldts SecretIndoor LED Grow Room Glasses | Grow Light Glasses LED Protection From Full Spectrum, Red/Blue, & Yellow Lights | Interchangeable Magnetic Sunglasses With UVA/UVB Blocking Protection

$87
Humboldts Secret Everything Kit 3-in-1 NPK Nitrogen Phosphorus Potassium with Kelp - Everything Indoor Plant Food 3-3-3, Everything Outdoor 5-5-5, and Everything Growing 20-20-20 (The Everything Kit)

Humboldts Secret Everything Kit 3-in-1 NPK Nitrogen Phosphorus Potassium with Kelp - Everything Indoor Plant Food 3-3-3, Everything Outdoor 5-5-5, and Everything Growing 20-20-20 (The Everything Kit)

4.5
$854
Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz)

Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (8 oz)

$539
Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$179
Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

4.7
$874
Humboldts Secret pH Up - Hydroponic pH Up - pH Up for Plants to Stabilize Nutrient - Plant pH Adjustment - Plant Nutrient pH Levels Optimizer (32 Ounce)

Humboldts Secret pH Up - Hydroponic pH Up - pH Up for Plants to Stabilize Nutrient - Plant pH Adjustment - Plant Nutrient pH Levels Optimizer (32 Ounce)

3.6
$206
Humboldts Secret Tree Trunk - Silicate Additive - Indoor Plant Food - Liquid Fertilizer (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz)

Humboldts Secret Tree Trunk - Silicate Additive - Indoor Plant Food - Liquid Fertilizer (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz)

4.6
$179
Humboldts SecretCalMag & Iron Supplement – Supports Vegetative and Flowering Stage (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

Humboldts SecretCalMag & Iron Supplement – Supports Vegetative and Flowering Stage (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

$148
Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System (8 Ounce)

Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System (8 Ounce)

$159
Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32 oz Set) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (32 oz Set) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$227
Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz)

Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz)

$408
Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz) w/Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food (32 oz)

Humboldts SecretSweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants – (32 oz) w/Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food (32 oz)

$749
Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8oz Set) w/ 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles (32oz)

Humboldts SecretA & B Liquid Hydroponics Fertilizer - Nutrients for Outdoor, Indoor Plants (8oz Set) w/ 2-Pack 100:1 Garden Hose End Sprayer | Multipurpose Reusable Bottles (32oz)

$160
Humboldts SecretEverything Growing Plant Food 20-20-20 Plant Fertilizer - Lawns, Gardens, Houseplants (2 lb) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses w/UVA/UVB Blocking Protection

Humboldts SecretEverything Growing Plant Food 20-20-20 Plant Fertilizer - Lawns, Gardens, Houseplants (2 lb) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses w/UVA/UVB Blocking Protection

$163
Humboldts SecretTree Trunk - Silicate Additive - Indoor Plant Food - Liquid Fertilizer (32 Oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretTree Trunk - Silicate Additive - Indoor Plant Food - Liquid Fertilizer (32 Oz) w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$166
Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

Humboldts SecretStarter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System w/Grow Room Glasses | Interchangeable Magnetic Sunglasses with UVA/UVB Blocking Protection

$500
Humboldts SecretEverything Growing Plant Food 20-20-20 Plant Fertilizer - Lawns, Gardens, House Plants (2 lb) w/Everything Indoor Plant Food with Kelp Liquid Concentrate 3-3-3 Fertilizer (8 Ounce)

Humboldts SecretEverything Growing Plant Food 20-20-20 Plant Fertilizer - Lawns, Gardens, House Plants (2 lb) w/Everything Indoor Plant Food with Kelp Liquid Concentrate 3-3-3 Fertilizer (8 Ounce)

$115
Secret Invisible Solid Antiperspirant and Deodorant, Powder Fresh, 0.5 Ounce Travel Size (Pack of 3)

Secret Invisible Solid Antiperspirant and Deodorant, Powder Fresh, 0.5 Ounce Travel Size (Pack of 3)

4.7
$131
Secret Powder Fresh Wide Solid Antiperspirant and Deodorant 2.7 oz

Secret Powder Fresh Wide Solid Antiperspirant and Deodorant 2.7 oz

4.7
$79
Alexander von Humboldt (Volume 81)

Alexander von Humboldt (Volume 81)

$55
Humboldts SecretFlower Shield – Plant and Flower Protection – Healthy Treatment for Pests and Fungus (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

Humboldts SecretFlower Shield – Plant and Flower Protection – Healthy Treatment for Pests and Fungus (32 oz) w/Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Energy for Plants (32 oz)

$385