Black walnut, birch, Lombardy poplar and sycamore all have their place. The question is whether a particular tree suits the space you want to plant. If you already have one, there is no reason to remove it simply because it appears on a list of trees to think twice about.
Black walnut and nearby planting
A large black walnut can give welcome shade, but planting under and near it takes some care. The tree produces juglone, a compound that can affect sensitive plants, including some garden vegetables and ornamentals. If you want to plant azaleas or peonies nearby, check their suitability for the spot first. Sensitivity and growing conditions vary. Fallen nuts and leaves also mean cleanup if a tidy lawn is important to you.
Birch needs the right spot
Birches offer striking bark and graceful growth, which explains why people want them in a garden. Many do better where the roots can stay cool and the soil does not dry out badly. A hot, dry site may call for a different tree, and the best choice depends on the kind of birch. Their shallow roots can be damaged by digging or repeated disturbance. Some birches are also vulnerable to pests, so look into the species and local conditions before planting.
Allow for poplar size and sycamore litter
Lombardy poplars grow quickly into tall, narrow trees, which can make them tempting when you want a screen. They may decline as they age, and weak branches or spreading roots can create problems near paving and underground services. That narrow outline is not a promise of a low-maintenance tree. If screening is the aim, weigh the eventual upkeep against the speed of growth before buying.
Sycamores can become magnificent large trees, but they need substantial space. They drop leaves, twigs and seed balls; some may also have pest or disease issues. In an open setting that litter may not bother you. Near a patio or a carefully kept lawn it may be a different matter. These are site-fit questions, not a verdict that every sycamore is unhealthy.
If you missed the earlier discussion of Bradford pear and Leyland cypress, start with Trees to Avoid (Part 1). Then compare the likely mature size of your shortlist with the advice in Making a Good Tree Choice. Nature’s Friends Landscaping can help with the choice, delivery and planting once you know what your yard can support.
