If I were you, I'd reserve the castings for potted plants. As long as you have earthworms in your garden, the roses in the ground are already getting some. If you want more castings in the garden, encourage more earthworms by adding things to the soil that they like -- used coffee grounds, unfinished compost, etc. If you don't have a lot of earthworms already, you can also order them. When I recently added composted manure to my beds, I found it to be full of little red wrigglers. I'm hoping they make their way down and start munching on all the leaves and tree trimmings lying under the mulch. It's not that castings would be bad for the garden, it's just that they're a somewhat expensive amendment to add when a garden full of "living soil" would be producing it, anyway. Pots, on the other hand, don't have that benefit. :-) ~Christopher

I've not seen, anywhere, where someone has analyzed mealworm castings although they seem to do research on many other similar things. Can't give a good answer but the castings from many other insect pests gets into the garden.

I just bought some at the Whole Foods in Princeton. They had two sizes, one for five dollars, the othe for ten. I have also seen them at Ferris Farms (690 Cranbury Road in East Brunswick) for approximately the same price. Copolla's in Edison has them. They seem very expensive to me. Are they worth the money?

Meyer lemon and store bought soil mixes Part II 13) Scotts Organic Group 72078500 Miracle-Gro, 8 QT Cactus, Palm & Citrus Mix Fast Draining Formula Contains A Mixture Of Sphagnum Peat Moss, Composted Forest Products, Sand & Perlite That Is Excellent For Growing Cactus, Palm, Citrus & Other Succulents Helps Prevent Soil Compaction And Improves Drainage, Feeds For Up To 6 Months With Miracle-Gro Continuous Release Plant Food. http://www.ronshomeandhardware.com/72078500-Cactus-Palm-Citrus-Potting-Mix-8-Qt-p/690493.htm 14) ORGANIC MECHANICS Container Blend Potting Soil Our all-purpose organic potting soil, perfect for repotting plants, fast growing annuals, outdoor containers, and more! Excellent drainage properties, yet holds moisture well Perennials, Woody Plants and Herbs love it! Great for large containers (up to 250 gallons) or any plant that needs well-drained soil Contains: compost, pine bark, coir, worm castings and rice hulls. http://www.organicmechanicsoil.com/products-catalog-organic-potting-soil.html 15) Miracle-Gro Cactus Palm and Citrus Potting Mix, 8-Quart Fast-draining formula, Enriched with Miracle-Gro Plant Food Beautiful, colorful results. Feeds up to six months http://www.homedepot.com/p/Miracle-Gro-Cactus-Palm-and-Citrus-Soil-72078500/204502296 16) Down To Earth 5-Pound Citrus Mix 6-3-3 7863 Designed to nourish citrus trees in home orchards and containers, our Citrus Mix is formulated with primary and secondary plant nutrients plus selected micronutrients that promote lush new growth, abundant green foliage, fragrant blossoms and bountiful fruit. It may also be used to feed other fruit trees, vines and ornamentals for equally enjoyable results. Ingredients: Feather Meal, Fish Bone Meal, Alfalfa Meal, Greensand, Langbeinite, Basalt, Sulfate of Potash, Zinc Sulfate and Kelp Meal. http://www.amazon.com/Down-Earth-5-Pound-Citrus-6-3-3/dp/B00KJ0IIZK/ref=sr_1_6?s=lawn-garden&ie=UTF8&qid=1430276562&sr=1-6&keywords=citrus+soil 17) Hoffman 10410 Organic Cactus and Succulent Soil Mix Organic cactus and succulent soil mix, professionally formulated for use with both jungle and desert cacti. Provides the drainage cacti need to flourish; ready to use; pH balanced. Complete package directions provide useful growing information. This product weighs 10 quarts. http://www.amazon.com/Hoffman-10410-Organic-Cactus-Succulent/dp/B0030UQLIM/ref=sr_1_5?s=lawn-garden&ie=UTF8&qid=1430276562&sr=1-5&keywords=citrus+soil That's the best I could find that seemed remotely deserving to be in the conversation. Atheen