Manzano Bigtooth Maple

Manzano bigtooth maple (*Acer grandidentatum* ‘Manzano’) is a New Mexico selection valued for its broad maple leaves and yellow-to-red autumn color. Plants sold under this name may be seedling-grown and variable, so treat “Manzano” as a named selection group rather than expecting every tree to be an identical clone. ## Landscape role and seasonal interest This small to medium shade tree is useful in residential yards, parks, and broad planting areas where its canopy and fall color have room to develop. The City of Fort Collins lists trees at about **20–30 feet tall and wide** and includes Manzano among its approved street trees, while warning against planting it beside heavily salted roads. Compared with typical bigtooth maple, its leaves are larger; autumn color ranges from red to yellow, and some leaves may remain on branches after they dry. Small yellow-green flowers open in early spring and are not a major ornamental feature. ## Growing conditions The selection is reported hardy to **USDA Zone 4**. Full sun or partial shade suits the species. Choose deep, well-drained soil; bigtooth maple tolerates a range of soil types and can grow with low supplemental irrigation once established. Keep a new tree evenly watered as roots develop. Local Fort Collins guidance says Manzano prefers moist conditions and can develop chlorosis in alkaline soil, so do not treat “low water” as “no water,” and avoid highly alkaline planting sites when possible. It is a poor choice where road salt is a recurring exposure. ## Selection and naming The selection originated in New Mexico’s Manzano Mountains. [Trees and Shrubs Online](https://www.treesandshrubsonline.org/articles/acer/acer-grandidentatum/) notes that plants sold as ‘Manzano’ are reputedly seedling-raised and may not be one uniform clone. The [Fort Collins plant profile](https://apps.fcgov.com/plant-list/?view=4-manzano-bigtooth-maple) reports limited availability. I did not find a named commercial breeder, brand, or verifiable plant-patent number in the references reviewed. [Utah State University Extension](https://cwelwnp.usu.edu/westernnativeplants/plantlist_view.php?id=13&name=acergrandidentatum) provides broader species-level landscape guidance. ## Maintenance Water during establishment, then adjust supplemental irrigation to rainfall, soil, and summer heat. Give the crown room and use selective structural pruning to develop sound branches; avoid pruning in early spring when maple sap is flowing. Utah State University Extension recommends pruning in late winter or late spring. Routine pest intervention is usually unnecessary, but inspect for minor insect damage, anthracnose, or root problems in poorly drained soil.