Cool-season flower profiles: alyssum, calendula, dianthus, pansy and snapdragon.
Compare the botanical identities, source-listed light and soil conditions, container evidence and local-calendar inputs for alyssum, calendula, dianthus, dusty miller, nasturtium, pansy, viola.
Choose the plant before choosing the quantity
Cool-season bedding is a seasonal purchase plan, not proof that every plant in the comparison tolerates the same temperature. A local spring or autumn window can differ from a North Carolina source. Identify annual versus perennial selections, then count only the plants for the selected seasonal layout.
The entries report the cited taxon’s growing conditions and descriptive dimensions. A mature width is separate from planting spacing; multiple light, moisture or life-cycle categories can reflect a genus, cultivar range or climate differences. Use the exact nursery label and local guidance to choose inputs. Soil categories describe the source record and supply no amendment recipe.
Alyssum
Alyssum: the cited botanical record is Lobularia maritima. This entry uses sweet alyssum, rather than every plant called alyssum.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage, moist, occasionally dry. Soil categories: clay, loam (silt), sand. Listed soil pH categories: Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0).
Reference dimensions: height: 0 ft 3 in to 0 ft 10 in; width: 0 ft 6 in to 1 ft 0 in. Life cycle listed: annual, perennial. Flowering season in the reference region: fall, spring, summer. Container use is explicitly listed in the source.
Source: NC State Extension Plant Toolbox: Lobularia maritima
Calendula
Calendula: the cited botanical record is Calendula officinalis. Pot marigold is the example; it is different from Tagetes marigolds.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage, moist. Soil categories: clay, high organic matter, loam (silt), sand. Listed soil pH categories: Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0).
Reference dimensions: height: 1 ft 0 in to 2 ft 0 in; width: 1 ft 0 in to 2 ft 0 in. Life cycle listed: annual. Flowering season in the reference region: spring, summer. Container use is explicitly listed in the source.
Source: NC State Extension Plant Toolbox: Calendula officinalis
Dianthus
Dianthus: the cited botanical record is Dianthus. Annual bedding pinks and perennial species have different life cycles; identify the selection first.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage, occasionally dry. Soil categories: clay, loam (silt), sand. Listed soil pH categories: Neutral (6.0-8.0).
Reference dimensions: height: 0 ft 4 in to 3 ft 0 in; width: 1 ft 0 in to 2 ft 0 in. Life cycle listed: annual, biennial, perennial. Flowering season in the reference region: spring, summer. Container use is explicitly listed in the source.
Dusty miller
Dusty miller: the cited botanical record is Jacobaea maritima. Silver-leaf dusty miller is the example; check the nursery botanical name because the common label can be ambiguous.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage, moist, occasionally dry. Soil categories: clay, loam (silt), sand. Listed soil pH categories: Acid (<6.0).
Reference dimensions: height: 0 ft 6 in to 1 ft 6 in; width: 0 ft 6 in to 1 ft 0 in. Life cycle listed: perennial. Flowering season in the reference region: fall, summer. Container use is explicitly listed in the source.
Nasturtium
Nasturtium: the cited botanical record is Tropaeolum majus. This species example is not identification of edible flowers or a nutritional recommendation.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage. Soil categories: loam (silt), sand. Listed soil pH categories: Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0).
Reference dimensions: height: 1 ft 0 in to 10 ft 0 in; width: 1 ft 0 in to 3 ft 0 in. Life cycle listed: annual. Flowering season in the reference region: fall, spring, summer. Container use is explicitly listed in the source.
Pansy / Viola
Pansy / Viola: the cited botanical record is Viola. Pansies and other violas differ in habit and seasonal performance; confirm the named selection.
Source-listed light conditions: dappled sunlight, full sun, partial shade. Drainage and moisture descriptions: good drainage, moist, occasionally wet. Soil categories: high organic matter, loam (silt). Listed soil pH categories: Neutral (6.0-8.0).
Obtain mature dimensions for the selected nursery plant; the reference supplies no single size range. Life cycle listed: perennial. Flowering season in the reference region: spring. Container use is explicitly listed in the source.
Snapdragon
Snapdragon: the cited botanical record is Antirrhinum majus. Compact and taller cultivars need different planting footprints.
Source-listed light conditions: full sun, partial shade. Drainage and moisture descriptions: good drainage. Soil categories: high organic matter.
Reference dimensions: height: 0 ft 6 in to 3 ft 0 in; width: 0 ft 6 in to 0 ft 10 in. Life cycle listed: annual, perennial. Flowering season in the reference region: fall, spring, summer. Container use is explicitly listed in the source.
Sweet pea flower
Sweet pea flower: the cited botanical record is Lathyrus odoratus. This ornamental flower is distinct from edible garden peas; it is not a food crop.
Source-listed light conditions: full sun. Drainage and moisture descriptions: good drainage, moist. Soil categories: high organic matter.
Reference dimensions: height: 3 ft 0 in to 8 ft 0 in; width: 2 ft 0 in to 3 ft 0 in. Life cycle listed: annual. Flowering season in the reference region: spring, summer. Container use is explicitly listed in the source.
Check the container and watering record
Where container use is listed, confirm the exact cultivar’s intended pot, drainage and medium with the nursery. A garden plant’s descriptive width does not determine a pot diameter or root-volume requirement. For dwarf trees, keep the named rootstock or compact cultivar dimensions with that record.
Observe the medium and follow the selected plant’s care instructions. A source describing moist soil does not supply a weekly irrigation volume. Pot size, plant size, medium and exposure belong in the watering record. Calculate litres only after the selected pot’s remaining fill has been measured.
Build a local planting calendar
Record your location, the selected cultivar and whether the purchase is seed, dormant stock or an actively growing plant. Obtain the local sowing or transplanting window for that material from the regional extension service or nursery. Record that window separately from the flowering season shown in the reference. Frost exposure, soil workability and the crop form can make a month from another region unsuitable.
For mixed orders, keep separate rows for each selection, its planned date, supplied along-row and across-row spacing and replacements. A species-wide width or a hardiness-zone label is insufficient to choose all of those values. This plan uses nursery or local guidance and contains no pesticide or nutrient treatment.
Turn the selected plan into a plant and bag order
For an independent illustrative 2 m by 1 m bed, supplied margins of 0.25 m on all sides and supplied spacings of 0.5 m in each direction produce four positions by two positions: eight plants. These are arithmetic inputs, not recommended spacings for the plants above. If the approved selection is sold in four-plant packs, the order is two packs.
For a separate container order with three measured empty-fill requirements of 8 L each, the total is 24 L. One selected 40 L bag covers the stated volume before any separately supplied allowance. The Soil Calculator calculates litres; it does not choose the growing medium, the container or a load-bearing location.
Use the matching calculator
Use this decision sequence
- Identify the exact species, crop type and cultivar or rootstock.
- Check the relevant source and local nursery guidance for growing conditions and planting window.
- Record supplied plant spacings or the selected container’s measured fill.
- Calculate positions and whole purchase packs separately for each selection.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Botanical record | A named example or genus record, not identification of an unknown plant. |
| Mature width | Descriptive size, separate from the selected planting spacing. |
| Planting date | A local window for the actual seed, dormant stock or transplant. |
| Watering | A plant and medium care decision, not the bed’s geometric volume. |
Worked comparison
A supplied four-by-two position plan contains eight plants and needs two four-plant packs. A separate three-pot order with 8 L of measured empty fill per pot needs 24 L of the selected medium, covered by one 40 L bag before any separately selected allowance.
Check before using the estimate
Check the exact cultivar and local restrictions before ordering. No species-wide figure establishes container fit, edible identity, support strength or planting success.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Sources and product references
- NC State Extension: Lobularia maritima
- NC State Extension: Calendula officinalis
- NC State Extension: Dianthus
- NC State Extension: Jacobaea maritima
- NC State Extension: Tropaeolum majus
- NC State Extension: Viola
- NC State Extension: Antirrhinum majus
- NC State Extension: Lathyrus odoratus
References support the factual distinctions and scope described above. Growing guidance is regional and care instructions are product-specific. Worked numerical examples are independent illustrative arithmetic.
Calculation and scope checked 2026-10-13. Methods and scope.
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