Pacific Coast Iris. Final Trials Report. Trials Office The Royal Horticultural Society Garden, Wisley, Woking, Surrey, GU23 6QB

Transcription

1 Pacific Coast Iris Final Trials Report Trials Office The Royal Horticultural Society Garden, Wisley, Woking, Surrey, GU23 6QB 1

2 RHS Trial of Pacific Coast Iris Introduction to Pacific Coast Iris Pacific Coast Iris are a beardless variety of Iris native to the West coast of North America. This group comprises a number of species; I. innominata, I. douglasiana, I. tenax and I. munzii. The species are difficult to grow in the UK, but the hybrids resulting from them are much easier to cultivate successfully. Objectives To assess, compare and demonstrate a range of cultivars submitted by individuals, raisers and nurserymen, following preliminary assessment by the Joint Iris Committee. Judging Entries were judged in 2011 by the Iris Sub Committee using a points system assessing the following attributes: Plant 35%, Stem 15%, Flower 30%, Presentation 20% Entries There were 23 entries in the trial, 14 of which were previous AGM winners as a display and point of reference. Cultivation Prior to planting the trial site was given a dressing of well rotted manure, and subsequently rotovated. The Trial was planted in late September 2008 from either existing or newly submitted material at 60cm stations in rows 90cm apart; three plants of each entry are grown. In the display bed, only two plants per entry were grown. Pine duff, locally sourced organic mulch derived from decomposed pine needles, was applied in late February 2009 to help retain soil moisture. In April 2010 a top dressing of ammonium sulphate and sulphate of potash was applied to increase nutrient availability. Each spring, once the main threat of frost has passed, the dead foliage of the previous year is removed. Overhead sprinklers were used when required. 2

3 Plants Receiving AGMs During Trial The following are the plants thought to fulfil the Award of Garden Merit criteria during the trial and to be worthy of receiving the award. The criteria which a plant needs to fulfil in order to receive the award are: excellent for ordinary garden use available from nurseries reasonably resistant to pests and diseases of good constitution essentially stable in form and colour reasonably easy to grow Hardiness ratings are as follows: H3 hardy outside in some regions; needs frost-free protection in winter H4 hardy throughout the British Isles Plants Awarded AGM Subject to Availability Iris Wisley Sunrise AGM (H4) 2011 [Trial No. 23] votes 8-0 Height: 30-40cm Large falls with distinct, frilled edges. Deep yellow standards and falls with distinct splash of orange towards the haft. Deep red/orange veining. Healthy plants. Distinct and unusual with lots of buds. Raiser/Sender: Mr J Gardiner Plants Awarded AGM Subject to Naming and Availability Iris Sdg GBS 105 AGM (H4) 2011 [Trial No. 16] votes 8-0 Height: 45-60cm Tetraploid flower. Vigorous plant with healthy foliage. Raiser/Sender: Mr P R Maynard 3

4 Trial Index and Senders Details No AGM Name Sender Arnold Sunrise' V H Humphrey 'Agnes James' Broadleigh Gardens Little Tilgates' B Price Big Money' Mrs M Probert Short Order' Mrs M Probert Ring o' Roses' Miss N K Scopes Floating World' Miss N K Scopes Peacock Pavane' Miss N K Scopes Pinewood Drama' Mrs E Wise Wise Gift' P R Maynard High Trees' B Price Blue Bossa' (Sdg FJW 19-00) F J Webbing Tumbler's Hill' (Sdg DPA1) Mrs O Wells Goring Gold' (Sdg GBS 206) P R Maynard 15 GBS 14/03 P R Maynard 16 Sdg GBS 105 P R Maynard 17 Amherst Jo' (Sdg G 9/1) Mrs T Naylor 18 Sdg C4/3 Mrs T Naylor 19 GBS 106 P R Maynard 20 Sdg PCI C3/6 Mrs T Naylor 21 Sdg PCI C3/1 Mrs T Naylor 22 Sdg PCI C3/5 Mrs T Naylor 23 Sdg JG1('Wisley Sunrise') J Gardiner Senders Broadleigh Gardens, Bishops Hull, Taunton, Somerset TA4 1AE C/o The Trials Office; V. H. Humphrey, P. R. Maynard, B. P. Price, Mrs M. Probert, C. Reeves, Miss N. K. Scopes, Mrs T. Naylor, F. J. Webbing, Mrs O. Wells, Mrs E. Wise. 4

5 Source: Horticultural Trials and Relations, RHS Garden Wisley, Woking, Surrey GU23 6QB More information about RHS Trials and other colour illustrated reports can be found on the RHS Website: 5