What to know

Cosmos , with theirvibrant bloomsand cheerful demeanor , are a darling addition to any garden . Starting them indoors allows for an early bloom clip and ahead starton the growing time of year . This detailed guide will cater you with all theessential knowledgeand step - by - pace instructions to successfully plant cosmos seeds indoors .

Choosing the Right Seeds and Soil

Cosmos seeds fall in awide arrayof colour and configuration . Select varieties that beseem your preferences and climate . expend a well - debilitate seed starting mix formulatedfor seedlings .

Preparing the Seed Trays

Fill cum trays orindividual potswith the semen start mix . Gently tauten the mixing to remove anyair pockets . Create shallow holes , about 1/4inch abstruse , in the soil .

Sowing the Seeds

plaza two or three existence seed in each cakehole . Cover the seeds lightly with theseed starting mixandgently pressdown . Water the soil exhaustively , but avoid overwatering .

Providing Light and Warmth

Cosmos seeds require sizable igniter for germination . Place theseed traysundergrow lightsor in a gay windowsill . Maintain a temperature of 70 - 75 ° F ( 21 - 24 ° ampere-second ) to promote germination .

Watering and Fertilizing

Keep the grease consistently moist but not soggy . Water sparingly , especially during theearly stagesof sprouting . Onceseedlings emerge , fertilise lightly with a balanced fluid plant food .

Thinning the Seedlings

As theseedlings produce , thin them out toencourage strong development . Remove weaker or crowded seedling , leaving only the healthiest one in each hole .

Transplanting Outdoors

When seedling have developed several true leaves and theweather permits , graft them outdoors . Harden off the seedlings bygradually exposingthem tooutdoor conditionsfor a calendar week or two before transplanting . Space the plant 12 - 18 in apart in well - drained dirt .

Enjoying the Bloom

Withproper care , cosmos plantswill bloom profusely throughout the summer and into the nightfall . Deadhead pass flush to further continuous blooming .

Troubleshooting

Why are my cosmos seeds not germinating?

Why are my cosmos seedlings leggy?

Why are my cosmos plants not blooming?

Quick Answers to Your FAQs

1 . When should I take up cosmos seed indoors ?

2 . How deep should I implant cosmos seeds ?

3 . How long does it take forcosmos seedsto germinate ?

4 . How often should I irrigate cosmos seedling ?

5 . Can Itransplant cosmos seedlings outdoorsin the fall ?

6 . How long do cosmos works bloom ?

7 . Do existence need full sun ?

8 . Are cosmos deer tolerant ?

9 . Do cosmos attract butterflies ?

10 . Can Isave cosmea seedsfrom my plants ?