Garden Care Guide

Spearmint Care

Mentha spicata

An aromatic perennial that likes moist, partially shaded places and spreads quickly by rhizomes. It should be grown in a pot or with a root barrier to limit its spread.

Hardy

Monthly care calendar

Timings are for a temperate Northern Hemisphere climate. In warmer areas tasks start earlier, in colder areas later; in the Southern Hemisphere shift them by six months.

March
  • Watering: Water a newly planted specimen more often than established plants during its first year, as its root system is still shallow.
  • Fertilizing: Apply a balanced fertilizer or well-rotted organic fertilizer once when it wakes from dormancy.
  • General care: Good time for planting and transplanting.
April
  • Watering: If there is no rainfall, water 1-2 times a week. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Good time for planting and transplanting.
  • Pests & diseases: Look for aphids (green or black clusters of small insects) on fresh shoot tips. If there are only a few, you can knock them off with a strong jet of water.
May
  • Watering: Water 2-3 times a week. Water so that the soil is wetted 10-15 cm down from the surface. Water a newly planted specimen more often than established plants during the first year; its root system is still shallow.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering. Harvest regularly before flowering; in autumn cut close to ground level.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Suitable period for planting and transplanting. Apply mulch 5-7 cm thick over the root zone; it conserves soil moisture and suppresses weeds. Do not press mulch against the stem.
  • Pests & diseases: Look for aphids (green or black clusters of small insects) on fresh shoot tips. If there are only a few, you can knock them off with a strong jet of water.
June
  • Watering: Water deeply 3-4 times a week, early in the morning. Water so that the soil is wetted 10-15 cm down from the surface. Frequent shallow watering pulls the roots to the surface.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering begins.
  • Pests & diseases: Look for aphids (green or black clusters of small insects) on fresh shoot tips. If there are only a few, you can knock them off with a strong jet of water.
July
  • Watering: Water deeply 3-4 times a week, early in the morning. Water so that the soil is wetted 10-15 cm down from the surface. Frequent shallow watering pulls the roots to the surface.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues. Keep it in a position sheltered from midday sun; scorching at the leaf edges is a sign of burn.
  • Pests & diseases: In hot and dry weather, look on the undersides of the leaves for fine webbing and speckled yellowing (spider mites). Washing the leaves during the cool hours reduces their numbers.
August
  • Watering: Water deeply 3-4 times a week, early in the morning. Water so that the soil is wetted 10-15 cm down from the surface. Frequent shallow watering pulls the roots to the surface.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • Plant protection: If symptoms spread and treatment is needed, consult a licensed plant-protection supplier or an agronomist. Plant protection products are regulated; follow local rules.
  • General care: Flowering continues.
  • Pests & diseases: In hot and dry weather, look on the undersides of the leaves for fine webbing and speckled yellowing (spider mites). Washing the leaves during the cool hours reduces their numbers.
September
  • Watering: Water 2-3 times a week. Water so that the soil is wetted 10-15 cm down from the surface. Water a newly planted specimen more often than established plants during the first year; its root system is still shallow.
  • Pruning: Regularly remove spent flowers at the base; this encourages new flowering.
  • General care: Good time for planting and transplanting.
October
  • Watering: If there is no rainfall, water 1-2 times a week. Water newly planted plants more often than established plants during the first year; the root system is still shallow.
  • General care: Good time for planting and transplanting.

The care advice on this page is general and for information only; it is not professional advice. Plant age, soil and your garden’s microclimate can change the outcome. Plant protection products are mentioned only as general information; they are regulated, and the choice, dose and timing must be decided by a qualified professional under local rules. Consult a landscape architect or agronomist before applying.

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