• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer

Grow Light Info

Helping You Choose the Right Grow Light

  • Grow Lights
    • LED Grow Lights
      • Buying Guides
      • Reviews
        • BestVA DC Series Review
        • HLG Review
        • KingLED Review
        • Mars Hydro Review
        • Phlizon COB Series Review
        • Spider Farmer Review
        • Viparspectra Review
      • Tips & Advice
    • HID Grow Lights
      • Buying Guides
        • Best CMH Grow Lights
        • Best HID Grow Lights
        • Best MH And HPS Bulbs
      • Tips & Advice
    • Fluorescent Grow Lights
      • Buying Guides
        • Best T5 Bulbs For Veg
        • Hydrofarm AgroBrite T5 Review
      • Tips & Advice
    • Grow Light Guides
      • Adjustable Grow Light Stands
      • Best Lights For Vegging
      • Best Lights For Flowering
    • Tips & Advice
  • Grow Tents
    • Grow Tent Buying Guides
      • Best Large Grow Tents
      • Best Small Grow Tents
      • Quictent Review
      • Secret Jardin Review
      • Vivosun Review
    • Grow Tent Info
  • Seeds
    • Best Place To Buy Marijuana Seeds
    • Best Autoflower Seed Banks
    • Highest Yielding Autoflowers
    • Seed Banks That Take PayPal
    • Crop King Seeds Review
    • ILGM Seed Bank Review
    • Marijuana Seeds NL Review
    • Seedsman Review
  • Other Equipment
    • Best Digital Scale For Weed
    • Best Fan For Grow Tents
    • Best Humidifier For Grow Tents
    • Best Microscope For Trichomes
    • Best Scissors For Trimming Weed
    • Best Timer For Grow Lights
  • Indoor Growing
    • Cannabis Cultivation
  • Cannabis Info
    • Useful Info
    • Fun
You are here: Home / Indoor Growing / Cannabis Cultivation

When To Add Bloom Booster (The Timing Is Key)

Last updated March 3, 2023 By Steven 2 Comments

When To Add Bloom BoosterAll plants need nutrients to grow.

Cannabis plants are no different.

But they need different nutrients at different times in their life cycle.

Bloom boosters come in handy during the bloom stage. They provide the nutrients a weed plant needs to grow bigger, more potent buds.

But you need to be careful when adding bloom booster.

If you add too much, you can do more harm than good.

And if you add it at the wrong time during the grow, you can also harm your plants.

Keep reading to learn when to add bloom booster for the best results. We’ll also show you exactly how to add it to ensure the best possible outcome.

Contents

  • 1 When To Add Bloom Booster
    • 1.1 What Are Bloom Boosters?
    • 1.2 When To Use Bloom Boosters On Weed Plants
    • 1.3 How Much Bloom Booster Nutrient To Use
    • 1.4 How To Use Bloom Boosters On Cannabis Plants In Five Easy Steps
      • 1.4.1 Materials Needed
      • 1.4.2 Step One: Timing
      • 1.4.3 Step Two: Read The Instructions
      • 1.4.4 Step Three: Check pH Level
      • 1.4.5 Step Four: Mix
      • 1.4.6 Step Five: Feed
  • 2 Adding Bloom Booster: Final Thoughts

 

When To Add Bloom Booster

The best time add bloom boosters is during the flowering stage (also known as the bloom stage), in order to promote the growth of fat and healthy buds.

Bloom boosters are concentrated forms of nutrients, specifically phosphorus and potassium. Phosphorus and potassium are particularly beneficial to plants during the flowering stage of their growth. That is why you want to add them during that stage.

We’ll get into more detail on exactly when to add the bloom boosters in a minute. First, let’s take a closer look at what exactly bloom boosters are.

 

What Are Bloom Boosters?

bloom boosters added in flowering

Bloom boosters are your answer, if you want to know how to make buds bigger during flowering.

Your precious cannabis plants require three main nutrients to grow strong and healthy and to give you a good yield of fat buds. Nitrogen (N), phosphorus (P), and potassium (K) are all vital for your plantโ€™s health.

The problem is that your plants need different amounts of these nutrients at different stages of the growth cycle.

Bloom boosters are concentrated forms of two of these essential nutrients: phosphorus and potassium, because those are the nutrients your weed plants need during the bloom stage of growth.

During the vegetative stage of growth, your plants require higher levels of the third macronutrient nitrogen. Adding extra nitrogen helps the foliage and stem grow more quickly, allowing the plant to grow bigger and stronger.

 

When To Use Bloom Boosters On Weed Plants

Following the vegetative stage of growth, your plants enter the flowering stage. During the flowering stage, giving your plants extra phosphorus and potassium will encourage them to develop bigger buds.

However, adding too many nutrients to young plants can shock and damage the young roots. The best time to add the bloom booster is during the second, third, and fourth weeks of the flowering stage.

As your plants pass through the vegetative stage, keep an eye on the points at which the fan leaves meet the stem. It is in these locations that you will first start to notice the appearance of pistils.

The pistils are white, hair-like protrusions, and their appearance tells you that your plants have started the flowering stage. From the time you first notice these, wait one more week before adding your bloom booster.

 

How Much Bloom Booster Nutrient To Use

marijuana plant grown with bloom boosters

You need to be a little careful when adding nutrients to your plants’ water. Too much can lead to nutrient burn, especially if the plant is still young.

Donโ€™t fall into the beginner’s trap of thinking that adding more nutrients means more buds. While there is some truth in this, adding too many nutrients will damage the plant’s health and may even lead to it dyingโ€”and you donโ€™t get more buds.

Bloom boosters are concentrated forms of the two nutrients which stimulate flower growth. Because they are in a concentrated form, you donโ€™t need to add very much.

Always consult the packaging on your bloom booster to see how much the manufacturer recommends. It does vary from brand to brand.

If you are just starting out as a grower, a good way to get a feel for how much bloom booster your plants need is to take a cautious approach. You want to avoid nutrient burn.

Many growers recommend (and we concur) using half the dosage suggested on the packaging on your first batch using a new brand of bloom booster. If that doesnโ€™t cause any ill effects, you can add a little bit more when you grow the next batch.

If you see any signs of nutrient burn, you can dial it back a bit next time. In this way, you slowly dial in the perfect dosage for future batches.

 

How To Use Bloom Boosters On Cannabis Plants In Five Easy Steps

add bloom boosters at right time

If you are not sure how to add bloom boosters to your marijuana plants, follow these steps to get it right. We’ll begin with the materials you need. If you’re not sure where to get them or what to get, we have recommendations on our list of things you need to grow marijuana.

 

Materials Needed

  • pH meter
  • Mixing cup
  • Water (preferably filtered)
  • Bloom booster
  • Syringe or scales
  • pH Up and Down solution

 

Step One: Timing

The first step is to ensure your plants are at the correct stage of their growth. You want to add the bloom booster during the second week of the flowering stage, not during the second week of total growth. Once you have seen pistils start to appear where the fan leaves meet the stem, wait one more week before adding bloom booster.

 

Step Two: Read The Instructions

There are different companies selling bloom booster, and each of them will use a slightly different formula when creating it. For this reason, it is important that you check the instructions and either follow their recommendations or take the cautious approach and use less than recommended at first (we suggest using half of the recommended amount).

 

Step Three: Check pH Level

Ph scale

You need to take a pH reading of the soil around your plants using your pH meter. You are looking for a pH level of 6.5, and if you are above or below this level, you need to make some adjustments.

The pH level is important, because when the soil is out of the ideal range, your plants will not be able to take up any nutrients.

If you find your soil is too acidic or too alkaline, you can use your pH Up and Down solution to fix the problem. Follow the manufacturer’s guidelines and apply the solution as needed.

 

Step Four: Mix

Here again, it is important to follow, and certainly not exceed, the manufacturer’s guidelines for your bloom booster. If you have a liquid bloom booster, you may find a small syringe in the packaging.

Use this syringe to mix the liquid bloom booster with the correct amount of water, as indicated by the manufacturer. You may need to weigh or measure out a granular bloom boosters to achieve the correct mix.

 

Step Five: Feed

At this point, you are ready to feed your plants. Then you can sit back and watch the magic happen. Remember, itโ€™s best to take a cautious approach to the amount you give your plants, especially if using a new brand for the first time.

Once you have fed your plants with the bloom booster for the first time, keep an eye on your plants over the next 24 hours. If they show any signs of nutrient burnโ€”browning at the edges of the leaves, for exampleโ€”you should flush your plants out with water. And you know you need to reduce the dosage next time.

 

Adding Bloom Booster: Final Thoughts

The key to using bloom boosters effectively is knowing when to add bloom boosters to your cannabis plant and how much to add. Make sure you do not add them too early or add to much of them.

Use the guidelines on the packaging, but it is always best to err on the side of caution. Better to use not enough than too much, and better to add the booster a bit later, rather than too soon.

If you are growing autoflowering weed plants and are looking for additional tips on maximizing your yields, read our article discussing how to get bigger yields from autoflowers.

Reader Interactions

Comments

  1. Jer says

    January 17, 2023 at 03:31

    Where is the best place to get a ph reader in Christchurch and cheaps don’t have to be to cheap

    Reply
    • Joseph Natale says

      September 3, 2023 at 02:19

      Donโ€™t waste u $$ next run go with a larger pot plastic believe it or not iMO is better and go with a organic potting soil like bumper crop or u can get bumper crop garden soil and add your own perlite or rice hills. Alway use about 15% native soil mixed in and if want a lighter soil mix some pro mix Hp organic with the native soil. Keep feeding the microbes and the soil does the rest 25 + year of growing and I never ever owned one, but I never ran in pure coco or hydro

      Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Recent Articles

thc cbn cbd and marijuana potency

What Are THC, CBN & CBD And How Do They Relate To Marijuana Potency?

Things That Cause Stress In Cannabis Plants

7 Things That Cause Stress In Cannabis Plants (And Why Stress Is Bad)

Improve Bud Quality In Cannabis Plants

6 Ways To Improve Bud Quality In Cannabis Plants

Top 10 Strains For Maximum Yield

Top 10 Cannabis Strains To Grow For Maximum Yield

How To Make Your Own Cannabis-Infused Edibles

How To Make Your Own Cannabis-Infused Edibles At Home (Easy Step-By-Step Guide)

Eco-Friendly Cannabis Cultivation

Eco-Friendly Cannabis Cultivation: 8 Tips For Growing Green And Sustainable

1 Gram Of Weed Per Watt Of Light

1 Gram Of Weed Per Watt Of Light (Is It Realistic & How To Achieve It)

How To Make Cannabis Tinctures At Home

How To Make Cannabis Tinctures At Home (Easy Step-By-Step Guide)

Save Electricity When Growing Weed

7 Tips To Save Electricity When Growing Weed

marijuana flowers

How To Make Bubble Hash At Home (Step-By-Step Beginner’s Guide)

Footer

Important Pages

  • Home
  • About
  • Contact Us
  • Privacy Policy
  • Affiliate Disclosure
  • Terms And Conditions

Image Reuse

Images on this site are free to share (unless attributed to a 3rd party), as long as you give credit to Grow Light Info and provide a link back to the page from which the image came.

Disclaimer

Some recommended products may use affiliate links. GrowLightInfo.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate I earn from qualifying purchases.

*Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Contact

Grow Light Info is owned and operated by:

McBrain Global LLC
30 N Gould Street, Suite R
Sheridan, WY 82801
USA

Phone: +1 (307) 269-0897
Email: mccabesteven9@gmail.com

Copyright © 2025 ยท McBrain Global LLC ยท All rights reserved.