Has anyone had problems with hummbirds not like the preservative?

I've been using this stuff for probably 10 years and I have no problem with them liking it they love it it takes good care of keeping my feeder fresh I would recommend it

Does the bottle show an expiration date? If I don't use it up this year, will it still be good next year?

The bottles do not have expiration dates on them, but the bag they come in does. I bought mine this year and they don’t expire until12/2026

Should the hummingbird nectar preservative be refrigerated?

We do not refrigerate the nectar preservative. It's not required.

Anyone know the milligram per liter concentration of copper sulfate in this stuff?

All it says on the bottle is that copper sulfate is a micronutrient; no percentages.

Nectar Defender Protects Nectar & Feeder, Keeps them fresh longer

Product ID: 107602388

Details

Brand
Sapphire Labs
Target Species
Hummingbird
Special Feature
Easy-Refill
Product Dimensions
3"L x 1.5"W x
Power Source
Manual

⏳Keeps nectar fresh up to 2 weeks

🌿100% natural, no artificial ingredients

🛡️Micronutrient formula prevents spoilage

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5709 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Sapphire Labs
Target Species
Hummingbird
Special Feature
Easy-Refill

Description

🕊️ Keep your hummingbird guests coming back for more with Nectar Defender!

SAFE NATURAL PROTECTION - Micronutrient blend guards nectar without any dyes or chemicals—pure care for your feathered friends.
OPTIMIZED FOR WARM WEATHER - Keeps nectar fresh even in the hottest months—never miss a hummingbird moment.
EFFORTLESS NECTAR ENHANCEMENT - Simply add to your homemade nectar mix—ditch the overpriced ready-to-use bottles.
LONG LASTING NECTAR FRESHNESS - Extend your hummingbird nectar life for up to 14 days—less hassle, more visits.
HEALTHY HUMMINGBIRDS HAPPY YOU - Supports hummingbird wellbeing with a clean, natural formula—because they deserve the best.

Sapphire Labs Nectar Defender is a natural nectar extender designed to keep hummingbird nectar fresh for up to two weeks, especially during warm weather. Its micronutrient formula prevents spoilage without artificial ingredients, ensuring a healthy feeding experience. Easy to use with homemade nectar mixes, it promotes hummingbird health and reduces maintenance frequency.

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