Sun Gro Sunshine #4 Aggregate Plus with Mycorrhizae | 3cu ft - Compressed

Premium Indoor Mix Boosted With Endomycorrhizae, 3cu ft

Adding beneficial fungi to a growing mix only helps if the fertilizer already in that mix doesn't overwhelm them, since high phosphorus levels can work against mycorrhizae establishment before the fungi ever get going. Sunshine #4 Aggregate Plus with Mycorrhizae addresses that directly, pairing the classic Mix 4 base with endomycorrhizae and a low-phosphorus starter fertilizer formulated to help the fungi establish rather than compete with heavy feeding.

This 3cu ft compressed bag also carries a higher amount of horticultural perlite for plants that prefer greater air porosity, and includes RESiLIENCE, a silicon-enriched additive.

Key Features & Benefits

• Endomycorrhizae-Boosted Base — adds beneficial fungi to the classic Mix 4 formula.
• Higher Horticultural Perlite — suits plants that prefer greater air porosity.
• Low-Phosphorus Starter Fertilizer — supports mycorrhizae establishment rather than competing with it.
• Includes RESiLIENCE — a silicon-enriched additive present throughout Sun Gro's professional mix catalog.

Who Should Use Sunshine #4 Aggregate Plus with Mycorrhizae

Indoor growers who want the classic Mix 4 profile boosted with endomycorrhizae and extra air porosity will find this premium formula suited to that setup.

About Sun Gro Horticulture

Sun Gro Horticulture extends its classic Sunshine Mix 4 profile with a mycorrhizae-boosted formula, using a low-phosphorus starter fertilizer designed to help beneficial fungi establish rather than compete with high nutrient levels.

Frequently Asked Questions

What is added to the classic Mix 4 base?

Endomycorrhizae and a higher amount of horticultural perlite than the standard formula. Together they're aimed at plants that benefit from both beneficial fungi and extra air porosity.

Why does this mix use a low-phosphorus fertilizer?

High phosphorus levels can work against mycorrhizae establishment, so a low-phosphorus starter fertilizer is included to better support the fungi getting established. Growers can add a fuller feeding program once the mycorrhizal relationship is set up.

Is this mix suited to indoor growing?

Yes, it's positioned as a premium mix for indoor growing where the extra air porosity and mycorrhizal boost make the most difference. It's built on the same classic Mix 4 base used across Sun Gro's line.

What does RESiLIENCE do in this mix?

It's a silicon-enriched additive included across Sun Gro's professional line, layered on top of the mycorrhizae and perlite additions. It's included alongside those features rather than in place of them.