How long after seeding (ttfescue, perennial rye, kbg) and applying fertilizer should i wait before using extreme lawn booster?

I applied after 2 mows. So I'd say about a month

Is this concentrated? If so, how many gallons of water do you add?

It is concentrated and you don't dilute it, the spray bottle system delivers the right amount with your hose water pressure (if it works well). Should take 30-40 minutes to apply.

will this kill my new seed they have not sprouted yet?

No, it won't kill your new seed -- in fact it will help establish them. All of the Simple Solution products do not burn and are in concentrations that are beneficial in virtually all cases. I have used most of them for a few years and they seem to be the best lawn products i have found.

I killed/scalped/detached weed-infested lawn and plan to slice-seed new tttf tall fescue. when before/after seeding should i apply this? (san diego)

Apply after seeds have sprouted. Best if sprayed with a sprayer that you can pre mix the water then spray.

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Extreme Grass Growth Lawn Booster- Natural Liquid Spray Concentrated Fertilizer with Fulvic & Humic Acid- Any Grass Type- Simple Lawn Solutions (1 Gallon)

Product ID: 519007971

Details

Brand
Simple Lawn
Item form
Liquid
Item weight
11 Pounds
Liquid volume
1 Gallons
Specific uses for product
Plant Growth

🌱Boosts vertical & lateral growth

📏Covers up to 12,000 sq ft

🧪Natural Fulvic & Humic acid formula

Description

🌿 Unlock your lawn’s full potential—because your grass deserves to be the envy of the block!

KID PET SAFE - Formulated with pure, organic feed-grade ingredients so your family and furry friends can roam worry-free.
MASSIVE COVERAGE - One gallon treats up to 12,000 sq ft—perfect for large yards or commercial spaces without constant refills.
PROUDLY AMERICAN - Crafted by a family-owned US business with 24 years of turf expertise—quality you can trust.
RAPID LAWN REVIVAL - Supercharge new sod and seeding with advanced growth acids for lush, thick turf faster than ever.
ALL GRASS COMPATIBLE - Tailored for every grass type from Bermuda to Bluegrass, ensuring vibrant results no matter your lawn.

Extreme Grass Growth Lawn Booster is a concentrated, natural liquid fertilizer enriched with fulvic and humic acids designed to accelerate both vertical and lateral grass growth. Suitable for all grass types and covering up to 12,000 square feet per gallon, it’s kid and pet friendly, easy to apply, and produced by a trusted US family-owned company with decades of turf industry experience.

Specifications

ASIN	B0716YCCZP
Brand Name	Simple Lawn Solutions
Coverage	12000
Customer Reviews	4.4 4.4 out of 5 stars (264)
Item Form	Liquid
Item Weight	11 Pounds
Liquid Volume	1 Gallons
Manufacturer	UAS of America
Mixing Ratio	1:0:0
Model Number	705672000739
Part Number	growthbooster-parent
Specific Uses For Product	Plant Growth
Target Species	Lawn Grass
UPC	705672000739
Unit Count	3785.41 millilitre

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