![]() Strongbox is a female variety and will develop black berries if a compatible male pollinator is planted in the vicinity. Remove root suckers regularly if you don't want the shrubs to colonize and spread.įertilize in spring with a fertilizer such as Holly-Tone. ![]() Keep in mind that this shrub requires full sun to part shade. Avoid areas of standing water, but consider those places in the landscape that tend to dry out a bit moreslowly than others. Pruning should be done in late winter/early spring just before new growth emerges, but pruning needs are minimal unless you are using the shrubs in a hedge. If you wish to trim or prune it, do so in mid-late spring, after the new growth has emerged. This distinguishes it from other hollies, which often prefer drier locations. Inkberry holly thrives in a wet, cool climate. Inkberry has shallow roots, so it's good that you have added mulch around the roots. Here are some other cultural considerations for inkberry: If you suspect canker or root rot, test the pH of your soil first as that is the most common cause of yellow leaves.įinally, in Michigan the foliage may suffer from winter burn when temperatures drop below minus 15 degrees Fahrenheit, which can also cause yellowing leaves. Prune out diseased branches as you notice them and take better care of the holly, watering during drought and mulching to retain soil moisture. The cankers appear as sunken or cracked patches of wood, and girdle the stems so nutrients cannot reach the leaves. The canker causes similar symptoms to root rot, including yellowing of the leaves andĭieback. ![]() Botryosphaeria canker affects weaker inkberry plants, usually following extremely high or low temperatures and drought. As the diseases cannot be cured, prevention by planting the inkberry in well-draining soil is your best bet.Ĭheck your holly bushes for cankers. Thiophanate-methyl will help with Thielaviopsis root rot and etridiazole and metalaxyl with Phytophthora. Fungicides cannot cure the holly plant of this disease but can stop the spread. Root rot occurs most often with flooding and extreme heat. ![]() Leaves, early leaf drop, slow growth and, eventually, branch dieback. Inkberry can suffer from Root rots, Phytophthora and Thielaviopsis black root rot. This is especially true if you have clay soil. This can cause even a moisture-loving plant to suffer from oversaturation, as water is likely to pool instead of draining away,limiting the roots’ intake of essential oxygen. A common mistake gardeners make when planting is to set the crown, or the point where the branches meet the roots, too deeply in the soil. The Lab will make recommendations for any needed soil amendments.Īnother possible cause for yellowing leaves is improper planting. Full instructions are there and also come with the kits. Self-mailer soil test kits from the Michigan State University Plant and Pest Diagnostic Lab are available. If you haven't done so, you may wish to conduct a soil test to determine your soil's pH level. This is an acid-loving species that thrives in rich, consistently moist, acidic soils. Inkberry is susceptible to chlorosis (yellowing of the leaves) if planted in high pH alkaline soil. The most likely cause may be your soil's pH level. Strongbox is a female variety and will develop black berries if a compatible male pollinator is planted in the vicinity.There are a few possible causes for the yellowing leaves on your inkberry. It can be pruned or shaped as you desire, or left to attain its neat natural shape. It has shallow roots, so a 2-3″ layer of mulch is a good idea. This native evergreen naturally grows as a broadly rounded mound, and keeps its leaves all the way to the ground for the lush, dense look you love. Little care is needed to enjoy Strongbox inkberry holly in your landscape. Strongbox inkberry holly is a bit broader and less rounded than our other inkberry holly, Gem Box ®. Plant Strongbox inkberry holly anywhere you’d use boxwood – as a hedge, edging, or specimen.
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