Flowers for the home and beyond: Paniculata Hydrangeas - garden rock stars

Paniculata hydrangeas, also known as piji hydrangeas, are the hardiest of all hydrangea species. What’s more, they are adaptable and very easy to grow, even for those with no experience. In Armenia, they can be purchased for 5,000 to 20,000 drams, depending on the size of the seedling.

Where to Plant

Paniculata hydrangeas are the most cold- and heat-resistant of all hydrangea species. It is recommended to plant them in a sunny spot where they can receive six or more hours of bright sunlight, as this encourages the strongest stems and lush flowers.

Soil

In general, paniculata hydrangeas are not picky about soil, but good drainage is a must. Soils that are too wet lead to root rot, so avoid planting them in areas where they stay wet for long periods of time. They can even grow in clay soil as long as it drains well. They are tolerant of a range of pH levels, from acidic to alkaline.

Planting

Do not amend the soil when you plant panicle hydrangeas. Do not add compost, potting mix, topsoil, etc. to the hole. This causes what is known as the “bathtub effect,” where the water soaks up the mix you added very quickly, but as it drains and gets into your natural soil around the hole, it pools around the roots, making them susceptible to rot.

Watering

Like any newly planted shrub or tree, panicle hydrangea needs regular watering for the first year or two. Once established, the plants can tolerate drought conditions, however, very hot, dry weather can compromise flowering, so regular watering is recommended.

Fertilizer

In general, panicle hydrangeas do not require fertilization. If you want them to grow faster, it is enough to apply a granular fertilizer for shrubs (such as rose fertilizer) in early spring. Avoid overfertilizing panicle hydrangeas, as this can lead to weakened stems.

Flowering

Paniculate hydrangeas bloom in the summer. The flowers are white at first, but as the days get shorter and the nights cooler, they begin to take on pink or red tones. The exact color depends on the variety, some varieties change color completely, while others do it gradually, creating a multi-colored shading effect.

The color that the flowers turn is a genetic trait that develops with the natural aging of the cells in the inflorescences and is not affected by any conditions in the soil, such as pH levels. You cannot change the color of panicle hydrangeas by treating them with aluminum sulfate or planting them in acidic soil.

Pruning

While pruning is not strictly necessary, it will help produce stronger stems, better blooms, and an overall more attractive shape.

When to Prune: Paniculata hydrangeas can be pruned in late fall, once the plant has gone completely dormant (i.e., has lost all its leaves and has been bare for at least two weeks), or in early spring, once new growth begins to emerge. Aim to prune the plant back by about a third of its total height. You should also trim off any spindly, spindly stems and side branches.