Agapanthus: planting, maintenance and flowering


Here is one of the undisputed queens of the garden with its pretty banded foliage persistent, semi-evergreen or deciduous depending on the variety, green or variegated, from which emerge immense stems up to 1 meter in height, proudly erect, which bear up to a hundred flowers arranged in umbels. Usually blue in color, this rhizomatous plant is a perennial with a singular habit which can also give white flowers, or even in pastel colors tending to mauve or violet, since there are different hybrids. Cultivated as much for its decorative foliage as for its sumptuous flowering, the agapanthus or blue tuberose likes hard soil as well as in pots.

Plant an agapanthus

The agapanthus thrives in a deep soil, perfectly drained, humus and lightweight, which retains freshness in summer. A calcareous soil does not disturb it too much and it also appreciates a slight acidity. We can therefore add a little heather soil to good quality topsoil.

She likes them hot situations, sunny – a partially shaded place may be suitable only in the southernmost regions -, sheltered from wind and severe frost because it is freezing from -5 ° C. Blue tuberose can therefore be installed in the ground in regions with a mild climate and in tubs or pots in areas with harsh winters because this allows it to be sheltered during the off-season.

It is in spring that we plant the agapanthus by respecting the following method.

  • Dig a hole large enough to accommodate the foot if it is already well developed, about three times the size of the root ball.
  • Place a layer of drainage at the bottom of the hole (clay balls, gravel, medium-sized pebbles).
  • Enrich with ripe compost.
  • Work the soil out of the hole to loosen it properly and add a little coarse sand if it is clay so that it is less compact. In addition, the sand promotes drainage.
  • Place the root ball in the hole, being careful not to injure the roots. The birth of the leaves must be flush with the natural level of the ground.
  • Fill the hole with soil and pack enough around the foot without injuring it.
  • Water copiously.
  • Apply a mineral or organic mulch to limit the drying out of the soil, subsequently reduce watering and slow down the development of weeds.

Thewatering from planting is very important to promote recovery. It eliminates “voids”, these air pockets detrimental to rooting. This is the reason why the agapanthus should be watered as soon as it is planted. even in case of rain.

It is essential to reserve sufficient space for it because it is a plant with substantial development in just a few years.

Blue tuberose can be grown alone, at the edge of the path, at the edge of a pond or swimming pool, in a lawn, or else associated in a bed with perennial plants with summer flowering, even with grasses, shrubs such as buddléia, banana or even palm trees. In a pot, container or jar, it brings incomparable vegetal touch on the balcony, terrace or patio.

Sow an agapanthus

It is possible to produce its agapanthus from the seeds. It is enough for that to make its sowing in May or June, when the risk of frost is completely eliminated. There is no particular problem, this plant being easy to reproduce this way, but you just have to be patient because it does not start to flower until after 3 or 4 years.

To sow an agapanthus, it is necessary to:

  • Harvest the seeds that succeed the flowers during the fall.
  • Sow them immediately in a soil for sowing, in a bucket, in a crate or in egg cells for example.
  • Spray the potting soil.
  • Place the seedlings in a bright room where the temperature is between 17 and 21 ° C.
  • Keep the soil moist.

It is necessary to count 21 to 28 days for germination. During the summer, each young plant should be planted in a small individual pot and then placed in the shade and protected from the wind but not in the cool. It will then be necessary to protect them from winter by bringing them in. They will be at set up in spring next and will not start to flower until after at least 3 years.

Multiply an agapanthus by division of the strains

After 4 to 5 years, you can start multiplying your agapanthus simply by dividing the clumps. The ideal period is spring. To do this, we extract the rhizomatous strain its hole with a spade fork, being careful to dig deeply so as not to cause injury. It is then enough to provide a perfectly sharp spade and then to cut cleanly the root block. Each new foot from a shard of the strain must have buds but also enough roots to be replanted without delay, either in the ground or in a pot. It will then be necessary to wait a year to see its new agapanthus bloom.

Caring for an agapanthus

Agapanthus is a spectacular plant which is suitable for all nature lovers, including home gardeners without any experience. She is not susceptible to pests and diseases. Certainly, it is a real treat for snails and slugs which can be protected by spreading a little sand or coffee grounds all around the foot to hinder the movement of gastropods.

On the other hand, the rigors of winter are really to be feared. Agapanthus in tank is to store in a cold greenhouse or under a frame from the first frosts. It can also be protected by several thicknesses of wintering veil (which also protects the container) and placed in a sunny corner sheltered from cold winds. Thus, she will spend the winter without blinking. This setting aside is to be extended until spring, ideally until the end of April, an ideal time for vegetation.

Concerning the watering agapanthus cultivated in the ground as in pots, they can resume in spring but in a moderate way. They need more support throughout the flowering period, especially if the summer temperatures are scorching. However, after a few years, those in the ground can be satisfied with a few summer showers and they are even quite able to adapt to dry soil.

When the flowers are faded, the stems should be cut as low as possible. This is the time when we start to reduce watering. The leaves who turn yellow they too must be removed during the fall. This is a sign that it is time to stop watering your agapanthus. Throughout the wintering period, you just have to keep the soil slightly moist. One watering per month is enough for a potted agapanthus. It may be less common if grown in open ground.

You have to think about enrich the substrate an agapanthus in the tank at the rate of once every two weeks, from April until September. As for the blue tuberose installed in the ground, it is satisfied with the decomposition of the mulch that we took care to spread at the foot during planting.

Finally, we recommend repot the agapanthus about every 4 years. The best time is early spring. Repotting is highly beneficial since it allows the substrate to be completely renewed. This obviously only concerns blue tuberoses in tubs.

Flowering agapanthus

It is between June and September that blooms the agapanthus. Its flowering can even last well beyond in a mild climate. However, some gardeners complain that their blue tuberoses do not bloom. There could be several reasons for this:

  • A pot that is too large: the agapanthus must feel a little cramped in its pot to bloom abundantly,
  • The stump is still too small: you have to give it time to grow a little,
  • The plant lacks heat or light (or both): the container must therefore be moved. If it is an agapanthus in the ground, it will probably be necessary to transplant it to another place so that it benefits from a better situation. This can only be done when spring is already well advanced, that is, when there is no longer any risk of frost.

It is fundamental to choose the location of your agapanthus before planting them in the ground because these plants do not like to be moved too much once they are well rooted. Their transplantation is therefore not abused.

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