When seeking the best fertilizers for Green Giant arborvitaes (Thuja Green Giant), there are several reputable brands and recommendations available based on various gardening sources.

1. Slow-Release Granular Fertilizers: Experts suggest using slow-release granular fertilizers, as they provide a steady release of nitrogen over time. A commonly recommended ratio is 10-10-10 or 14-14-14, which is well-balanced for these trees and promotes robust growth. This information is supported by resources such as Gardening Know How and Fast Growing Trees, both emphasizing the importance of balanced fertilization.

2. Milorganite: This organic fertilizer has been noted for its additional benefit of deterring deer, making it a practical choice for gardeners concerned about wildlife. Milorganite can be particularly effective when used around Green Giants to encourage healthy growth while protecting them from herbivores (source: Houzz).

3. Miracle-Gro Fertilizer Spikes: According to a review from Simple Showing, Miracle-Gro Tree & Shrub Fertilizer Spikes, which has a formulation of 15-5-10, ranks high among options specifically for arborvitaes. These spikes are celebrated for their slow-release properties and ease of application (source: Simple Showing).

4. Tree-Tone: Another product frequently mentioned is Tree-Tone, which purportedly supplies all necessary nutrients without sulfur. The application involves creating holes around the plants to assist nutrient absorption (source: Hewitt's Garden Centers).

These fertilizers can significantly benefit the growth of Green Giant arborvitaes by providing the necessary nutrients they need for healthy development. For more detailed recommendations and experiences from gardeners, you can explore discussions on Reddit or delve into specific articles from gardening blogs and sites.

Overall, a mixture of well-balanced slow-release fertilizers, specific brands like Milorganite and Miracle-Gro, and organic options such as Tree-Tone can help ensure the robust growth of your Green Giant arborvitaes.

Sources

Best fertilizer to push a lot of growth on evergreen green giant ...Fertilizer For Arborvitae: How And When To Feed Arborvitae TreesBest Fertilizer for Green Giant Arborvitae (Thuja Green Giant) - HouzzWhat Kind of Fertilizer and How Much to Apply for Green Giant ArborvitPlant Care 101: Thuja Green Giants - Fast Growing Trees5 Best Arborvitae Fertilizers | How And When To Use ThemFertilizing thuja green giants - Hewitt's Garden Centers

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