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Ranunculi Trenton Black

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Bring bold elegance to your garden with Ranunculus Trenton Black (Ranunculus asiaticus)! Perfectly suited for gardeners of all experience levels, this striking variety delivers stunning blooms with minimal effort. Ideal for cool to arid climates, these flowers flourish in light, well-draining soil, producing lush, rose-like scarlet blooms atop sturdy stems with delicate, fern-like foliage. Trenton Scarlet planted en masse looks stunning in garden beds, borders, and containers, creating a vibrant, eye-catching display. Individual stems make beautiful, long-lasting cut flowers for indoor displays. With its rose-like blooms and captivating colour, this variety is a superb choice for adding rich warmth and a touch of sophistication to all landscapes and homes.

Description

Introduction to Ranunculi Trenton Black

Ranunculus Black (Ranunculus asiaticus), also known as Persian Buttercup or Persian Crowfoot, brings a stunning display of rich, multi-petaled dark blooms to your garden in spring. Renowned for its deep, dramatic hue, this variety makes a captivating addition to garden beds, borders, pots, and naturalised settings. Perfect for cool, temperate, Mediterranean, semi-arid, and arid climates, these flowers can bloom for six to eight weeks, delivering a bold burst of striking colour to the landscape.

Benefits of Growing Ranunculus

With its bold, dark blooms, Ranunculus Black creates stunning displays in garden beds and containers. The long-lasting flowers continue to flourish, especially with regular deadheading to encourage new blooms. These dramatic flowers are also perfect for cut flower arrangements, adding a touch of elegant sophistication to indoor spaces. The rich colour and striking presence of this variety enhance any garden, creating a captivating and dynamic focal point.

Climate-Based Planting Guidelines

For best results, plant Ranunculus from March onwards, ensuring the corms are planted before winter. This timing allows them to establish strong roots, leading to healthy, vigorous blooms in spring across different climates.

When Your Ranunculus Corms Arrive

For optimal growth, plant corms as soon as they arrive, ideally in autumn when the ground is cool. This timing allows the corms to establish before winter. Choose a well-draining soil, enriched with compost or aged manure to support healthy root development. In regions with heavier soil, amend with sand or additional compost to improve drainage, ensuring the soil is suitable for growth. Avoid fresh manure, as its high nitrogen content can harm young corms.

Planting Ranunculus

Ranunculus thrives in light, well-draining soil with a slightly acidic to neutral pH (6.0-7.0). For containers, use a high-quality potting mix enriched with compost. At planting time, apply a light organic or chemical fertiliser to support initial growth.

Planting Depth and Spacing:

  • Space corms 10–15 cm apart
  • 4 cm deep in cooler climates
  • 8 cm deep in warmer climates to protect from temperature fluctuations

Ranunculus thrives in full sun but benefits from partial shade in hot climates. Plant in a sheltered spot with at least 6 hours of daily sun for vibrant spring blooms.

Watering and Fertilising

Water well after planting and keep the soil moist but not waterlogged. Once shoots appear, water when the top layer of soil dries slightly to prevent rot. Apply liquid fertiliser when buds appear for more blooms, and in spring, use a complete fertiliser to sustain growth. Mulching helps retain moisture and stabilises soil temperature.

Dormancy and Aftercare

As summer approaches, Ranunculus enters dormancy. Once the foliage has dried and turned brown, reduce watering significantly to keep the soil mostly dry, protecting the corms in this resting phase. Corms can remain in the ground year-round with a light layer of mulch for insulation. For potted Ranunculus, move containers to a cool, shaded area to prevent overheating.

Pests and Diseases

Like other Ranunculus varieties, these may attract aphids, slugs, and snails. Maintain good air circulation, and water at the base, and clear plant debris regularly to prevent issues. For powdery mildew, apply a baking soda solution or fungicide, and prune any affected areas to control Botrytis blight.

Harvesting Cut Flowers

Ranunculus blooms make beautiful cut flowers. Harvest in the morning when buds are just opening for a longer vase life. Cut above a set of leaves at an angle for better water uptake. Place stems in cool water right away, refreshing every two days. Store cut flowers in a cool spot, away from ethylene-producing fruits like apples.

Safety Considerations

Although not considered toxic or a skin irritant, it’s best to keep Ranunculus out of reach of children and pets. Sensitive individuals may prefer to wear gloves when handling the corms. If ingestion or skin irritation occurs, seek medical advice.

Supplied as dormant corms.

Additional information

Price Code

B – Aqua Pack

Botanical Name

Ranunculus asiaticus

Quantity in Pack

20 Bulbs

Flowering Time

Spring

Planting Time

Plant from March onwards

Growing Height

40-60 cm

Planting Depth

Plant corms 4 cm deep in cooler climates, or 8 cm deep in warmer climates.

Soil

Ranunculus thrives in light, well-draining soil with a slightly acidic to neutral pH (6.0-7.0). Enrich poor soils with compost or well-aged manure. Avoid fresh manure as its high nitrogen content can harm young corms.
In regions with heavier soil, amend with sand or additional compost to improve drainage, ensuring the soil is suitable for growth.
If your soil retains too much water, improve drainage by mixing in sand, perlite, or well-rotted compost to create a looser, more porous structure. This adjustment helps prevent waterlogging and allows the roots to breathe.

How to Plant

These plants thrive in full sun and, in warmer climates, benefit from midday shade to help their blooms last longer. Aim for at least 6 hours of sunlight daily and choose a sheltered spot to protect their delicate flowers from the wind.

Enrich the soil to a depth of 20 cm with compost or well-aged manure to boost fertility and drainage for healthy root growth. Before planting, lightly mix an organic or chemical fertiliser into the top layer of soil in garden beds or a well-draining potting mix for pots, ensuring essential nutrients for strong initial development. Soak the corms in lukewarm water for an hour to hydrate them and encourage quicker sprouting. For garden beds, plant corms 15 cm apart, legs downward, at a depth of 4 cm in cooler regions or 8 cm in warmer climates to protect against temperature fluctuations. When planting in pots, place corms slightly closer together—ensuring they have space to grow without overcrowding, are not touching each other, and are in well-draining potting mix. Cover with soil and water thoroughly to settle the corms. Mulching is optional but beneficial, as it retains soil moisture, regulates temperature, and reduces weed growth.

Watering

Water thoroughly after planting, keeping the soil consistently moist but avoiding waterlogging. Once shoots appear, water weekly, allowing the top layer of soil to dry slightly between waterings to prevent root rot. Containers may need more frequent watering, especially in hot weather.

Once the foliage has fully dried and turned brown, reduce watering significantly. At this point, the plant is fully dormant and keeping the soil mostly dry will help protect the corms during this resting period. A very light, occasional watering in warmer dry regions may be required to prevent the corms from drying out completely but avoid excess moisture to prevent rot.

Fertilise

Apply a light organic or chemical fertiliser at planting time. Once buds appear, apply a liquid fertiliser to encourage abundant blooms. Then, apply a complete fertiliser in spring to sustain growth.

Pruning

Ranunculus requires little pruning. Deadhead spent blooms regularly to encourage new flowers throughout the season. Since corms tend to weaken and produce fewer blooms after 1 to 2 years, these plants are best treated as annuals or biennials. Once flowering has finished, remove any remaining spent blooms, but allow the foliage to turn yellow and die back completely before cutting it away—this helps the corms store energy for future growth. In cool and hot, dry climates, corms can be left in the ground; however, in hot and humid regions, it’s best to lift and store them or treat them as annuals.

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