Blaumeise (Hydrangea macrophylla ‘Blaumeise’)

Hydrangea macrophylla 'Blaumeise' is a deciduous lacecap bigleaf hydrangea with broad, flat flower heads and glossy, coarsely toothed leaves. It is also sold under names such as 'Teller Blue' or 'Blue Sky Teller'.

Give it morning sun and afternoon shade, especially in hot climates. It can tolerate more sun if the soil stays consistently moist, but intense afternoon heat may scorch the leaves and fade the blooms.

Water deeply whenever the soil surface begins to dry, keeping the root zone evenly moist but not waterlogged. During hot or dry weather, container plants may need water daily.

Plant it in humus-rich, moisture-retentive, well-drained loam. Incorporating compost or leaf mold can improve moisture retention without creating stagnant, poorly drained soil.

It is generally suited to USDA Zones 6–9 when planted in a protected location. Flowering can be less reliable in colder areas because winter may damage the old stems that carry next season’s buds.

It can grow in full sun where summers are mild and the soil remains reliably moist. In warmer parts of the United States, afternoon shade is safer and usually produces better foliage.

Yes, it tolerates partial shade well, but dense shade may reduce flowering and produce weaker growth. Bright morning light or filtered light is usually the best compromise.

A mature plant commonly reaches about 4–6 feet tall and wide, although size varies with climate, pruning, moisture, and winter damage. Allow enough room for its rounded, multi-stemmed habit.

Wilting usually results from dry soil, excessive heat, root damage, or waterlogged soil. Check moisture several inches below the surface and correct watering or drainage rather than watering on a fixed schedule.

Brown leaves are commonly caused by drought, hot afternoon sun, wind, transplant stress, or inconsistent watering. Keep the soil evenly moist, mulch the root zone, and protect the plant from harsh afternoon exposure.

It usually needs only modest feeding if planted in fertile soil. Apply a balanced, slow-release fertilizer in spring, and avoid excessive nitrogen because it can promote leafy growth at the expense of flowers.

Possible pests include aphids, hydrangea scale, capsid bugs, and vine weevils. Inspect new growth and leaf undersides regularly, and use the least disruptive control appropriate for the infestation.

It may develop leaf spot, powdery mildew, gray mold, or, less commonly, honey fungus. Improve air circulation, water the soil rather than the foliage, and remove badly affected plant material.

Plant it in spring or fall when temperatures are moderate and the soil is workable. Spring planting is preferable in colder Zones 6–7 locations so roots can establish before winter.

Set it at the same depth it grew in its nursery container, backfill with well-drained soil amended with organic matter, and water thoroughly. Apply a 2–3-inch layer of mulch while keeping mulch away from the stems.

Yes, it grows well in a large container with drainage holes and moisture-retentive potting mix. Choose a pot at least 18–24 inches wide and monitor moisture closely because containers dry faster than garden soil.

Repot it when roots circle the container, drainage slows, or the plant dries out unusually fast, usually every few years. Move it into a container only modestly larger to avoid waterlogged excess soil.

Take softwood cuttings in early summer or hardwood cuttings during winter dormancy. Use healthy, nonflowering stems in a sterile, evenly moist rooting medium, although cultivar identity is best preserved through cuttings rather than seed.

You can grow hydrangeas from seed, but seedlings will not reliably reproduce the exact characteristics of 'Blaumeise'. Use cuttings if you want flowers and growth that match the parent plant.

Division is generally not the preferred propagation method because this shrub has a woody, multi-stemmed structure rather than easily separable herbaceous crowns. Layering or stem cuttings are usually more practical.

Prune immediately after flowering, or remove only dead and damaged wood in spring. This cultivar flowers primarily on old wood, so late winter or early spring pruning can remove the coming season’s flower buds.

After flowering, remove faded heads and cut overly long stems back to a healthy pair of buds. Avoid routine hard cutting because the next year’s flower buds may already be developing on those stems.

Deadheading is optional and mainly improves appearance. Remove spent flower heads after flowering, but leave them over winter if they provide useful protection for buds or add seasonal interest.

It has low toxicity if eaten, but ingestion may cause gastrointestinal upset such as vomiting, diarrhea, or drooling. Prevent pets from chewing the plant and contact a veterinarian if significant amounts are consumed.

It is considered low risk in small accidental amounts, but eating the leaves, flowers, or other plant parts may cause gastrointestinal discomfort. Keep prunings and plants away from young children.

It generally blooms in summer, often from early to late summer depending on climate and winter survival. Flowering may be reduced after a severe winter or untimely pruning.

The flowers can be deep blue, blue-purple, or lilac-blue in acidic soil with available aluminum. In alkaline soil, they may become pink, mauve, or softer purple instead.

Maintain an acidic growing medium and test the soil before applying a hydrangea bluing product containing aluminum. Results vary with soil chemistry, and repeated treatments should follow the product label to avoid damaging the plant or surrounding soil.

The color usually shifts when soil conditions limit aluminum availability, often in alkaline soil. Soil pH, existing soil chemistry, irrigation water, and the plant’s growing conditions all influence the final color.

It is primarily an old-wood bloomer rather than a reliably remontant cultivar. Protecting overwintering stems is therefore important if you want the best flowering the following summer.

The most common causes are winter damage to old flower buds, pruning at the wrong time, excessive shade, drought stress, or excessive nitrogen. Protect the stems in cold areas and prune only after flowering.

Yes, its lacecap flower heads can be cut for fresh arrangements and may also dry attractively. Harvest stems when the florets are mature and the heads feel firm rather than newly opened.