Home > Herbaceous
Common name: KnotweedFlower colour: RedAspect: TolerantSize: MediumSeason: SummerDelivery: Mail order or collection: see opening timesSoil: Moist and well drainedPlant type: HerbaceousImage: WTGN
(Knotweed) A new variety of the sxtremely robust hardy perennial and ideal choice for difficult sites with poor soil or with limited sun light.
Clumps of mid-green foliage act as a great foil for the very dark, slender red flowers held on tall stems in mid to late summer. The tips of the flower spikes are almost black and then open to darkest red and the flowering period may be as long as mid-summer until October. The flowers will attract both bees and butterflies.
Persicaria was formerly grouped with Polygonum before the taxonomists thought the better of it, and has in the past had a reputation of being a 'weed' - whatever that means! Actually, its slightly thuggish, and certainly very robust, nature is one of its most valuable attributes because it can thrive where other more demanding plants might just give up.
Persicaria amplexicaulis 'Blackfield' will form bold clumps, up to one metre across - these can be readily split in the spring for propagation.
Fully hardy. Height: flowering stems up to 1.2m
We are a small and very busy working nursery and we do not have the capacity to continually update pot size information on our web shop as we are continually propagating and potting plants up. Therefore any one plant type may be in different pot sizes at different times of year. However, we hope the following notes will be useful
1. We do not sell any plants in 'plug' sizes - all our plants are of a size that is appropriate for planting out in the garden.
2. Early in the year herbaceous perennials may be in 9cm (1/2 litre) or one litre pots. As we enter summer a lot of herbaceous perennials move on to 2 litre, 3 litre and occasionally 4 or even 5 litre pots.
3. Shrubs are generally in 2 litre pots at minimum, moving up to 3, 4 and 5 litres as appropriate, occasionally 7.5 litres or even 10 litres
4. Our smallest trees may be in 3 litre pots but are generally in 7.5 to 10 litre pots, some moving on to 15 litres and occasionally 20 litres
5. Flowering dogwoods, one of our specialities, are in pots ranging from 7.5 litres to 15 or occasionally 20 litre pots.
If you want to know the specific pots size of a plant please use the 'contact us' feature on the web shop, or call us on 01953 488163, although as we spend so much time on the nursery...you guessed it... propagating and potting up plants you may need to leave a message which we will endeavour to answer the same day.
Our minimum charge for sending plants by overnight courier is £9.95 which will cover the cost of up to 10 small plants, for example herbaceous perennials. This is an overnight service from when your plants leave the nursery which is normally Thursday, to arrive Friday - all ready for a great weekend in the garden.
The amount charged is calculated on the notional weight of plants, and you will find that a number of small plants, for example herbaceous perennials in 9cm, one litre or even two litre pots, can be bought for the same £9.95 shipping charge.
Adding additional plants to your order will progressively, but moderately, increase the shipping charge, but this is made entirely explicit in your shopping basket, where you can add or remove items and watch how the shipping charge alters accordingly. The maximum charge for delivery is £18.95 which would cover an unlimited number of plants.
Due to the fact that, including the cost of the boxes and so on, we pay considerably more than £9.95 for each shipment, our delivery charges are in effect subsidised by us. For that reason we have to ask for a minimum purchase of £25 before delivery in order minimise our losses.
For shipping to remoter addresses, for examples Highlands and Islands, Northern Ireland and so on, please contact us and we will be able to provide you with a quotation.
We try to run Walnut Tree Garden Nursery in the most environmentally friendly manner possible. These are some of the steps we have taken:
1. We only use peat free compost although occasionally young plants and propagation stock arrives in peat-based composts. The balance of composts on the nursery is at least 90% peat free compared to peat.
2. We clean and re-use long life plastic pots where possible.
3. Customers can return the pots that came from us for re-use.
4. No single-use pots or trays (e.g. polystyrene bedding trays) are ever used.
5. We always hand water and do not use overhead sprinklers in order to minimise water waste.
6. We use biological control of pests where possible (e.g. parasitic nematodes against vine weevil)
7. We only use the bare minimum use of pesticides and fungicides – strictly on an 'as needed’ basis –after dusk and only on foliage to protect pollen and nectar seeking insects.
8. Mains electricity is 100% renewable, purchased from Bulb
9. Electricity is also supplied by on-site photovoltaic panels during daylight hours
10. Since May 2020 we donate to COTAP.org carbon-offset projects in order to compensate for carbon emissions relating to all aspect of our business (pot and compost production, deliveries, mail order couriers, leaflet printing and so on) . As of November 2020 we have purchased 28 tonnes of carbon offsets.
11. We propagate as much of our stock on-site as possible, which reduces carbon miles. Propagation material that we buy in is at as small a growth stage as possible to minimise carbon miles. We often propagate from seeds: for example, a batch of seeds arriving by post might weight no more than 50-100 grams but which we will grow on to produce to 2-3,000 plants, in peat free compost, often in pre-used pots.
12. In addition to all the herbaceous perennials and woody shrubs that we sell, we also sell approximately 500 trees annually. Therefore, since we started the business in 1998 we have sold some 21,000 trees, hopefully leading to a cascade of environmental benefits in our customer's gardens.