Best Bloom Booster Fertilizers – 15 Products Fully Reviewed

The difference between standard and bloom boosting fertilizers is akin to a quick snack and a steak dinner – the latter provides greater energy and nutrients, which (like us) plants need to perform better.

Bloom boosters not only increase flower size and mass, they’re also designed to make fruit-bearing plants taste better and stimulate root health, which all adds up to an epic gardening win.

If you want big buds (and of course you do), the following fertilizers have got you covered!

Key Takeaways

Flower Fuel is ideal for those wanting standout vegetable and flower yields. Jack’s Classic Blossom Booster will suit new gardeners needing a budget-friendly feed.

The Incredible Bulk Organic Bloom Booster is the perfect choice for eco-friendly gardeners.

Main Recommendations

Jack’s Classic Blossom Booster

  • NPK ratio: 10-30-20
  • Container size: 1.5 pounds
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

Living up to their solid reputation in the industry, this water-soluble feed provides a generous nutrient ratio at a budget to suit all gardeners with a well-honed formula that results in brighter colors and longer blooms on all indoor and outdoor flowering plants.

This can be applied to the roots and leaves, and many customers have praised its ability to revive near-dead plants to nursery-like freshness!

Pros:

  • Higher nutrient formula than most
  • Works through leaves and roots
  • Indoor/outdoor use
  • Comes with measuring cup
  • Great for low-nitrogen veggies and fruits

Cons:

  • May burn especially dry/sunburnt plants

Miracle-Gro Bloom Booster Flower Food

  • NPK ratio: 10-52-10
  • Container size: 5.5 pounds
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

Flower and veggie growers alike will adore this high-yield, water-soluble booster that will feed multiple trees and flowering beds for many months!

The sky-high phosphorus count means prolific bud and fruit production, and the overall ratio is just right for providing root system support and glossy green foliage.

For stellar results, use the feed in conjunction with the Miracle-Gro garden feeder for a more versatile application than with just a watering can.

Pros:

  • Impressive yield
  • High-nutrient formula
  • Promotes stronger root systems
  • Absorbs through roots and leaves
  • Great results with vegetables and herbs too

Cons:

  • Burns will occur without strict feeding routine
  • Won’t be effective on plants already into their blooming cycle

Dr. Earth Flower Girl Organic Bud & Bloom Booster

  • NPK ratio: 3-9-4
  • Container size: 4 pounds
  • Slow-release food: Yes
  • Organic: Yes
  • Can also be used on vegetables: Yes

This hand-crafted blend of alfalfa meal, fishbone meal, mined potassium sulfate, and soft rock phosphate translates to consistently happy blooms and flowers and great-tasting fruits.

Dr. Earth has also added seven strains of beneficial soil microbes and probiotics to the mix to ensure flower beds remain healthy and nutrient-rich long after application.

This formula also makes it ideal for making compost tea – making your feed stretch out a little further!

Pros:

  • All-natural ingredients
  • 7 strains of TrueBiotic soil microbes
  • Non-GMO
  • Decent yield
  • Supports root establishment

Cons:

  • Pungent unpleasant smell after soaking

Scotts Super Bloom

  • NPK ratio: 12-55-6
  • Container size: 2 pounds
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

As global leaders in the plant-care market, Scotts certainly lives up to expectations with this fast-acting, water-soluble feed.

The blend of key micronutrients contains all that young and established flowering plants need to bloom and vegetables to prosper!

The generous phosphorus content will help with faster plant maturity and bud growth galore – just take care when applying as a little goes a long way.

Pros:

  • Enjoy results after one application
  • High-nutrient formula
  • Works on young and older flowering plants
  • Ideal for small vegetables, i.e., cherry tomatoes

Cons:

  • Too easy to overuse and risk burns
  • A tad pricey for the volume

Espoma Organic Flower-tone

  • NPK ratio: 3-4-5
  • Container size: 4 pounds
  • Slow-release food: Yes
  • Organic: Yes
  • Can also be used on vegetables: No

While low in overall NPK numbers, this all-natural, slow-release feed by Espoma provides a balanced formula of 15 essential nutrients, enhanced further by thousands of living microbes to prolong bloom health and profusion by increasing soil fertility.

Gardeners rave about its effectiveness with hanging basket flowers in particular. To get the best out of the Bio-tone microbes, use this feed before the printed use-by date.

Pros:

  • All-natural ingredients
  • Bio-Tone formula
  • Good value
  • 15 essential nutrients for complete diet

Cons:

  • Won’t perform as effectively in alkaline soils

Envy Bloom Special

  • NPK ratio: 10-50-10
  • Container size: 1.5 pounds
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

Designed using professional-grade nutrients, this high-phosphorus micronutrient blend will invite the green-eyed monster to your patio and window-box displays with its quick-absorbing, water-soluble formula that injects color vibrancy and explosive blooms to your flower patch.

While Envy Bloom shines with flowering plants, many gardeners also noted impressive growth rates and deeper green foliage in shrubs and small trees like plumeria.

Pros:

  • Includes measuring scoop
  • Blends micro, macro & secondary nutrients
  • Results within first application
  • Great for small trees/shrubs
  • For outdoor/indoor plants

Cons:

  • Needs lighter use than instructed on smaller plants.

Farmer’s Secret Fruit & Bloom Booster

  • NPK ratio: 2-15-15
  • Container size: 16 ounces
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

This robust liquid fertilizer really is the “full package,” using zinc and iron alongside additional macro and micronutrients to not only up your flower game but also increase fruit and veggie yields and enhance plant hardiness and disease resistance.

Farmer’s Secret takes care of fruit trees, shrubs, vegetables, and all flowering plants and can be applied as either a root feed or foliar spray.

Pros:

  • High-nutrient concentration
  • Effective for fruit, vegetable, and flower use
  • Works through roots or leaves
  • Improves yield and plant stamina

Cons:

  • Pricey for the volume

Flower Fuel

  • NPK ratio: 1-34-32
  • Container size: 250 grams
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

This premium flower feed packs an impressive 40 ingredients into its small volume including essential amino acids, hormones, and several nutrients and vitamins that contributes to high yields and flavorful crops.

This strong formula also contains resin and essential oils resulting in dense, show-stopping blooms, which can, unfortunately, overwhelm smaller flowering sites!

Pros:

  • High yield
  • 40-ingredient formula
  • Impressive vegetable growth
  • Excels in soil, hydroponic, or aeroponic systems
  • Comes with dual measuring scoop

Cons:

  • Unsuitable for small flower beds
  • Best results with established blooms

Indoor & Outdoor Plant SuperBoost

  • NPK ratio: 0-0-0
  • Container size: 32 ounces
  • Slow-release food: No
  • Organic: Yes
  • Can also be used on vegetables: Yes

More than meeting its promise of “XL grow” on the bottle, this all-natural liquid feed by SuperBoost is a great all-around fertilizer if you want to enjoy plentiful blooms and fast-growing veggies without the harsh chemicals.

The organic formula of essential nutrients allows you to safely use SuperBoost alongside other fertilizers without hassle and also helps to heal root rot.

Pros:

  • All-natural ingredients
  • Can be used safely with other fertilizers
  • For indoor/outdoor use
  • Helps to heal root rot
  • Also great for trees and vegetables

Cons:

  • Should be used alongside a fertilizer with an acceptable NPK ratio.

Incredible Bulk Organic Bloom Booster

  • NPK ratio: 0.1-10-25
  • Container size: 1 pound
  • Slow-release food: No
  • Organic: Yes
  • Can also be used on vegetables: Yes

Just as expected, this impressive eco-friendly blend can help every gardener grow flowers like a superhero.

The balanced combo of phosphate and potash increases yield while improving the color vibrancy and overall potency of your flower garden.

Also, while most fertilizers require you to flush your plants after application, this all-natural, vegan formula boasts a no-burn, residue-free formula so you can conserve water for when your plants need it.

Pros:

  • High yield
  • Vegan formula
  • Eco friendly
  • Doesn’t require flushing
  • Won’t burn from overfeeding
  • Great for seedlings too

Cons:

  • A tad pricey for the volume

Twin Canaries (Fox Farm) Liquid Nutrient Trio

  • NPK ratio: 6-4-4 (Grow Big), 2-8-4 (Tiger Bloom), 0.01-0.3-0.7 (Big Bloom)
  • Container size: 16 ounces (3-pack)
  • Slow-release food: No
  • Organic: Yes
  • Can also be used on vegetables: Yes

Used together, this brilliant trio of liquid fertilizers benefits each stage of your plant’s cycle – whether you’re wanting bountiful blooms or plump veggies – thanks to a high-potency formula that encourages nutrient cycling in the soil to keep things looking great.

Start with Grow Big for a strong foliar structure before switching to Tiger Bloom to promote multiple buds.

Big Bloom can be used throughout the growth cycle to support most plants from seed to coaxing maximum bloom sizes.

Pros:

  • Impressive flower yield
  • Caters to each growth stage
  • For indoor/outdoor plants
  • Suitable for hydroponic growth

Cons:

  • Big Bloom may run out long before the others

Grow More Fertilizer

  • NPK ratio: 10-52-10
  • Container size: 25 pounds
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

This bulk-batch, water-soluble feed by Grow More is loaded with phosphorus to encourage sturdy root development while the addition of extra nutrients including zinc, manganese, iron, and copper help to increase and extend your bud yield.

Its pure 100% soluble formula means it can dissolve even in cold water so you can get straight to feeding your young plants and established flower beds without much fuss.

Pros:

  • High-phosphorus count
  • Additional essential nutrients
  • Can dissolve in cold water
  • High yield

Cons:

  • Don’t expect great results with vegetables

PetraTools Organic Fruit & Flower Fertilizer

  • NPK ratio: 3-3-5
  • Container size: 32 ounces
  • Slow-release food: No
  • Organic: Yes
  • Can also be used on vegetables: No

This fully organic, water-soluble fertilizer is developed with corn, seaweed, and fish meal leaving it brimming with amino acids and micronutrients that promote the population of beneficial microbes in your soil.

This gives plants greater nourishment and results in brighter blooms and extra tasty fruit!

PetraTools expert blend also helps your flowering plants access more nutrients as they develop by stimulating root growth while the amino acids actively correct any nutrient deficiencies in the soil.

Pros:

  • Nutrient-rich blend
  • Promotes beneficial soil microorganisms
  • Fast-acting formula
  • Also great for fruit
  • Benefits roots and soil deficiencies

Cons:

  • Smaller container than expected for price

Humboldt County’s Sonic Bloom

  • NPK ratio: 0-51-34
  • Container size: 100 grams
  • Slow-release food: No
  • Organic: No
  • Can also be used on vegetables: Yes

Containing 20 times the vitamin B1 content of other popular bloom boosters on the market, this pricey but powerful fertilizer will deliver sensory shock waves throughout your flower patch by enhancing the oils and fragrances of herbs, boosting flower mass, and enhancing crop flavor.

Additional doses of vitamin B2, B3, and B6 work further wonders in your plants by regulating drought tolerance and protecting plant cells against early death by reducing their sensitivity to light!

Pros:

  • High-vitamin content
  • Great for herb and vegetable growth
  • Suitable for hydroponic systems
  • Gives fruit improved, even taste
  • Won’t burn due to overuse

Cons:

  • Expensive
  • Requires some math as measurements are given for 5-gallon mixes

BioAdvanced All-in-One Rose & Flower Care

  • NPK ratio: 6-9-6
  • Container size: 4 pounds
  • Slow-release food: Yes
  • Organic: No
  • Can also be used on vegetables: No

If you’re dreaming of a stunning rose garden, this combined flower feed, pesticide, and fungicide will give young buds and mature blooms all the armor they need, and a single application will see them right for up to 6 weeks.

The active ingredients imidacloprid, tebuconazole, and clothianidin work together to fight foliage blight and scores of sap-sucking bugs while promoting root development so your flowering bushes can keep accessing those bloom-boosting nutrients.

Pros:

  • 3-in-1 formula
  • Long-lasting results
  • Encourages root growth
  • Rainproof for 6 weeks

Cons:

Wrapping It Up 

Most of the above-mentioned fertilizers will deliver bloom-enhancing results to your landscape, but the best choice for you will ultimately depend on your flowering site size (i.e., window-box or flower bed) and whether you want to see results for a specific flower.

In case you’re still stuck, Laura Bennet of the Humid Garden blog advises “water-soluble over powder” to avoid wind scattering and to “always check the label” to ensure the NPK ratio will suit your plants.