Alstroemeria

A detailed cultivation guide on how to grow alstroemeria.

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How to grow alstroemeria

Plant into a well-drained, medium to coarse-textured growing mix. With larger pots and longer crop times, there is greater need for more perlite, pumice, coir, or bark in mix to avoid compaction and shrinkage of media.

Ideal average daily growing temperature 55º-58ºF (13º-14ºC). If grown lower than 50ºF (10ºC) average, rhizomes can go dormant. Can be grown with warmer days if can keep soil temperature <60ºF (15.5ºC). Alstroemeria does not grow or flower well at temperatures >80ºF (27ºC), so plan on growing this crop for spring sales only, unless in Northern regions. If grown cooler than ideal, will delay flowering. If grown warmer than ideal, plants will not be as compact

Common causes why alstroemeria is not flowering:

  • Soil temp >60ºF (15.5ºC)
  • Short days
  • Low light conditions
  • Poor rhizome development
  • Lack of fertilizer
  • Wet soil - Pythium
  • Too low of temperature
  • Excessive thinning of shoots
  • Low light conditions
  • Low calcium levels in soil
  • High air temperature
  • Overwatering

Alstroemeria cultivation guide

Transplanting alstroemeria
Remove 50-cell plugs carefully from trays so as not to damage roots. Do not bury plugs when transplanting. Keep soil surface of plug level with soil surface of finished pot. If buried, number of shoots may be reduced and delayed.

Container sizes and crop times:

  • 8-inch (20 cm) = 16 weeks
  • 10-inch (25.5 cm) = 18 weeks
  • 12-inch (30 cm) = 20 weeks

Best growing media for alstroemeria
Plant into a well-drained, medium to coarse-textured growing mix. With larger pots and longer crop times, there is greater need for more perlite, pumice, coir, or bark in mix to avoid compaction and shrinkage of media.

Optimal growing temperature for alstroemeria
Ideal average daily growing temperature 55º-58ºF (13º-14ºC). If grown lower than 50ºF (10ºC) average, rhizomes can go dormant. Can be grown with warmer days if can keep soil temperature <60ºF (15.5ºC). Alstroemeria does not grow or flower well at temperatures >80ºF (27ºC), so plan on growing this crop for spring sales only, unless in Northern regions. If grown cooler than ideal, will delay flowering. If grown warmer than ideal, plants will not be as compact.

Ideal light conditions for growing alstroemeria
Alstroemeria likes high light levels but cool soil temperatures, as the plant is originally from the Andes mountains. Provide light levels >3000 footcandles or >5 moles per day (DLI). Lower light levels will delay flowering by 7 - 10 days. Avoid high leaf and soil temperatures when using high light levels. Will flower up to 2 weeks faster with longer days and more total light.

Alstroemeria water and feed needs
Alstroemeria is a thirsty crop, so keep even moisture in containers and avoid too dry or too wet. Feed as needed with 150 - 200 ppm N from balanced fertilizers such as 15-5-15, 17-5-17, or 13-2-13, which contain calcium and magnesium. Avoid using controlled release fertilizers when growing cool, as less N available to plants at that cool temperature and salts may build up. If leaves turning more yellow, increase ppm or feed more often. Keep media pH 6.0 - 6.5 as this plant likes more alkaline conditions. Maintain media EC 2.0 - 2.5 (SME).

Growth regulators for alstroemeria
None needed

Flowering alstroemeria
Controlled more by photoperiod, total light, and cool temperatures. Remove old flowering stalks and leaves by pulling up quickly from the base. This technique will allow continuous flowering of plants. Do not cut them off. If needed, yank out blind shoots to improve flowering.

Insects and diseases common for alstroemeria
Thrips, aphids, slugs and snails, fungus gnats, root rots (especially Pythium), Botrytis.

Common problems and causes growing alstroemeria

Plants do not flower:

  • Soil temp >60ºF (15.5ºC)
  • Short days
  • Low light conditions
  • Poor rhizome development

Poor plant vigor:

  • Lack of fertilizer
  • Wet soil - Pythium
  • Too low of temperature
  • Excessive thinning of shoots

Flower bud abortion:

  • Low light conditions
  • Low calcium levels in soil
  • High air temperature
  • Overwatering

Flamingo Holland cannot be liable for any loss of profit, growing result, or any other commercial damages resulting from the use of this guide. This guide is for information purposes only and are not warranted for content, accuracy, or performance overall.

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Alstroemeria