Lysimachia Alexander

Overview & Key Characteristics

• Botanical name: *Lysimachia punctata ‘Alexander’. 

• Common name: Yellow Loosestrife (variegated variety) ‘Alexander’.

• Habit: Herbaceous perennial growing upright stems, spreading via rhizomes to form a loose patch. 

• Size: Typically about 18–23 in (45–60 cm) tall and similar spread under good conditions. 

• Foliage & Flowers: Variegated leaves edged cream/white (sometimes tinged pink early), topped by upright spires of star‑shaped yellow flowers in early to mid‑summer. 

• Hardiness: Generally rated for Zones 4‑9; some sources list to Zone 3 for very hardy conditions. 

Light & Site Requirements

• Sun: Full sun to part shade. Best bloom and habit in full sun or morning sun/afternoon shade situations. 

• Soil: Prefers moist to average moisture soils; humus‑rich, well drained. Performs especially well in “moist, humusy, well‑drained soils” according to a botanical garden note. 

• Moisture: Though adaptable, the variegated foliage can suffer in overly dry soils — edges may brown if soil dries out. 

• Positioning: Because it can spread by rhizomes, choose a site where spreading is acceptable or plan for containment. Some sources recommend leaner/drier soils if spread must be limited. 

Planting, Watering & Maintenance

• Planting: In spring or early autumn. Prepare the soil with some compost if very poor, but avoid extremely rich soils that may encourage overly vigorous spread.

• Watering: Whilst establishing, keep the soil reasonably moist. After that, it tolerates average garden moisture, but avoid letting it become bone‑dry.

• Fertilizing: A general top‑dress of compost in spring is usually adequate. Heavy fertilization may lead to too vigorous spreading.

• Pruning/after bloom: Remove spent flower spikes to keep tidy. Consider dividing every few years if clumps become congested or to control spread. 

• Containment: For garden beds where spread is undesired, you may want to install a shallow barrier or plant in a contained bed/edge. 

Cold‑Climate / Zone 3 Considerations

• While ‘Alexander’ is officially rated from Zone 4, listings (for example under “Golden Alexander”) show hardiness down to Zone 3a. 

• For your region (Saskatoon / Zone 3 environment), success will hinge on:

  • Good drainage (important for winter/spring melt).

  • A site that gets plenty of light (full sun or bright part shade).

  • Avoiding prolonged dryness – even though it tolerates average moisture, the variegated foliage needs some consistent moisture for best appearance.

• Overwinter: Provide usual garden protection (mulch lightly if site is exposed), but ensure the base isn’t sitting in overly saturated soil during freeze/thaw cycles.

• Because of its moderate height (~18‑23 in), this plant works as a bold mid‑border item in a cold‑climate garden.

Photo from gardenia.net