Gro 'n Sell
Trachelium Supreme (NEW)
From Evanthia, Supreme is a uniform Trachelium series with a uniquely cool hued palette. Supreme produces stems with a large central cluster of star-shaped flowers, surrounded by several smaller flower heads on side branches.
The Supreme series can be produced almost year-round in milder climatic conditions, but where other varieties may struggle to reach sufficient height during the summer period, this is precisely where Supreme excels. Therefore, be sure to plant young Trachelium Supreme plants from late spring into summer for excellent quality from summer into autumn. Combine with Trachelium Corine for a robust year-round program.
Order 10 or more weeks before your desired ship date.
Grown in a 128 tray, billed as 125.
About Tray Sizes (please read)
210 and 125 cell trays are full-sized trays, and three of these will fit in a shipping box.
50 cell trays are half-sized trays (unless otherwise noted) and two of these are the equivalent of one full sized tray. Six of these will fit in a shipping box. These trays are long and skinny. (Think hotdogs). There are not compatible with 25 cell half trays. Scoop scabiosa, veronica, solidago, gypsophila, hypericum, herbs, some tweedia, and others are grown in the 50 cell tray.
*Chrysanthemums and Dahlias are grown in the same 50 cell half tray as mentioned above, but due to their height, they take up twice as much space. So TWO half trays of mums takes up 2/3 of the box.
25 cell half trays are also half-sized trays, but they are short and square. (Think hamburgers). These are not compatible with 50 cell half trays. Limonium and astrantia are grown in this tray.
Gerberas are also grown in a 25 cell half tray, but are tall that the others, and FOUR of these half trays of gerberas fills a box.
18 and 32 cell trays are full sized trays specifically for our vernalized perennials. These have their own set of shipping rules (find details HERE) and cannot be combined with items grown in 210, 125, or 50 cell trays.
Growing Guides
Click here to access all of our comprehensive growing guides.
| Common Name | Trachelium, Throatwort |
| Genus | Trachelium |
| Species | T. caeruleum |
| Family | Campanulaceae |
| Life Cycle | Half-hardy annual, short-lived perennial in warmer zones |
| Format | Plugs |
| Plug Care | Bump up into larger cells or plant out soon after arrival - do not allow them to become root bound or the overall success of the plant will be affected. Keep well watered while in the plug trays - do not allow to dry out. Harden off for a couple days before planting out. |
| Netting / Staking | One or two layers of netting is recommended to keep plants upright and stems straight. |
| Temperature Range | Plants will grow best when days are 60-75F and nights are 55-65F but mature plants will fare well in summer heat. Fall planting in the field should be left for those in zones 8 or warmer. Early spring planting or fall planting in a tunnel is best in cooler zones. |
| Spacing | 6-9" apart |
| Soil Preference | Soil must hold moisture but be well-draining. Saturated soils will encourage the development of root diseases. Water frequently to keep the soil damp. Amend soil with compost prior to planting or fertilize regularly with liquid 20-10-20 (or similar) for best growth. |
| Day Length | Obligate long-day plants. Plants require 16 hour days to initiate flowering. |
| Pinching | Pinching not necessary. By not pinching you will get a larger central umbel with several smaller side umbels called 'satellites'. Pinching will create more uniform stems. Space plants more closely together if you aren't planning to pinch and give them more space if you are going to pinch - those side branches need room to develop. |
| When to Plant | The Lake Michigan cultivar has the greatest potential for year-round production in warmer climates. Can be planted mid-winter to early spring for spring and summer flowering, or in the summer to early fall for winter flowering (artificial lighting required to initiate budding). |
| Harvesting | Harvest stems when half or more of the individual florets in an umbel are open. Buds will continue to open in the vase. Planting to harvest can happen in 16-18 weeks. |
| Post Harvest Care | Cut stems should be stored in fresh water or use a holding solution. Store at 40F and avoid exposure to ethylene. Vase life averages approximately 11 days. Extended cold storage in the cooler will decrease vase life. |
| Diseases / Insects | The most prevalent insect pests are aphids, leaf rollers and thrips. The most common diseases are bacterial blight, pythium, phytophthora, rhizoctonia. Space plants properly to allow for good air movement through the foliage and plant in well drained soil to avoid root diseases. |
| Bailey's Notes | Trachelium 'Lake Michigan' are lightly scented and add a delicate, lacy texture to arrangements. |
| Resources | Trachelium Lake Series Culture Sheet |