Gadenin日本語Get the appThe shoots come up before you expect them
Tulip noses often break the surface during a mild spell in late winter, weeks before there is any flower. This is normal and the leaves are hardy; frost may scorch the margins of exposed foliage but it does not kill the plant or damage the bud, which is still well below ground.
Resist the urge to protect them with a heavy mulch at this stage. Piling material over emerging shoots traps moisture around the crown and is a direct invitation to botrytis. If a hard freeze is forecast and shoots are well up, a light layer of straw or row cover laid loosely for the night is sufficient, and it comes off in the morning.
Growth is fast once it starts. From a two-inch shoot to an open flower is typically three to five weeks depending on temperature, and a cold spring produces shorter, longer-lasting flowers while a warm one produces taller stems that go over in days.
Water sparingly, and only if spring is dry
In most gardens spring rainfall is enough and you never water tulips in the ground at all. The bulb's job in spring is to grow, flower and then dry off, and constant moisture at the base of the plant is the condition botrytis needs.
Water only when the top three inches (8 cm) of soil are dry during active growth, and then water thoroughly at the base rather than sprinkling. Wetting the foliage and letting it stay wet overnight is what spreads fire from leaf to leaf. Morning watering, so the leaves dry within an hour or two, is much safer than evening watering.
Stop watering entirely once the petals drop. From that point the bulb is heading into dormancy and wants to dry out. Containers are the exception and are covered in the container guide, because a pot can dry out completely in a day and does need attention.
| Stage | Water | Feed |
|---|---|---|
| Shoots emerging | Rain only unless the soil is dust dry | None needed |
| Buds forming | Water deeply if two dry weeks pass | Optional balanced feed, low nitrogen |
| In flower | Keep the base moist, never the leaves | None |
| Petals dropped | Stop watering | One high-potassium feed if keeping the bulbs |
| Leaves yellowing | None | None |
Tulip fire, and knowing when to give up on a bulb
Tulip fire is a botrytis specific to tulips and it is the disease that matters. The first sign is a shoot that emerges distorted, twisted or scorched-looking, as though it has been burnt. Leaves then develop small pale spots with darker edges, flowers get brown flecks and rot in the bud, and in damp weather a gray fuzz appears on affected tissue.
It spreads by spores from infected plants and it survives in the soil as small black resting bodies on the remains of rotten bulbs. That is why it comes back in the same bed year after year, and why the answer is removal rather than treatment. There is no spray a home gardener can rely on to cure an infected planting.
Act early and decisively. Lift any plant that emerges distorted, take the bulb and as much surrounding soil as you can with it, and put it in the household waste rather than the compost pile. One infected plant removed on the day you notice it will save a bed; the same plant left for a fortnight in wet weather will not.
Prevention is planting into cold soil, spacing bulbs so air moves between them, keeping foliage dry, and never replanting tulips into a bed that showed fire. Inspect bulbs before planting and discard any with sunken dark lesions on the tunic or a soft base plate.
Gray mold on a single flower after days of rain is not necessarily fire. Fire distorts the shoot as it emerges, before any weather could be blamed. That emergence stage is the reliable tell.
Staking, wind and flopping stems
Tall tulips lean and sometimes snap, particularly after heavy rain fills the flowers with water. Most of the cure is at planting time: deep planting, full sun so the stems grow sturdy rather than reaching, and no high-nitrogen feeding, which produces soft growth.
For a bed you cannot replant this year, grow the tulips through something that holds them. Low shrubs, wallflowers, forget-me-nots or hardy geraniums planted among them give the stems physical support and hide the untidy foliage later. Individual canes look worse than the flopping does.
Shelter matters more than height. A tulip in an exposed corridor between two buildings will suffer at any height, while the same stem in a walled garden stands up fine. If one part of the garden flattens tulips every year, plant shorter-stemmed types there and save the tall ones for the sheltered ground.
Aphids, and what else turns up
Aphids cluster on stems and inside buds, particularly on plants brought on under cover. They weaken the plant slightly and can transmit virus, which shows as pale streaking or feathering on leaves and broken color in the flowers. A plant with virus never recovers and should be removed so it does not act as a source.
Slugs and snails graze emerging shoots and rasp holes in petals in wet springs. Check under pot rims and boards at night, when they are active. Squirrels sometimes take an interest again in spring and will bite off flower heads for no obvious reason; the wire mesh laid at planting time does nothing about that, and a temporary net is the only fix.
Record the date you first saw fire, aphids or damage, and which block it was in. Tulip problems repeat in the same place, and a note from last spring is what tells you to plant that corner with something else this autumn.