How to Plant Bulbs

Updated on February 6, 2020
OldRoses profile image

Caren White is a Master Gardener and instructor at Home Gardeners School. She has been associated with Rutgers Gardens for over a decade.

A drift of daffodils at Rutgers Gardens
A drift of daffodils at Rutgers Gardens | Source

Planting bulbs is easy and rewarding. Spring flowering bulbs such as daffodils need only to be planted once for years of color. Summer flowering bulbs such as dahlias which need to be replanted every year in colder growing zones allow you the freedom of trying them in different spots in your garden every summer.

What are the Different Types of Bulbs?

First let’s talk about the different kinds of bulbs. The term “bulb” refers to several different types of fleshy underground plant parts. True bulbs look like onions, shaped like a Hershey’s Kiss with roots coming out of the bottom. They should be planted point up, roots down. Corms and tubers look like flattened bulbs with roots coming out of the bottom. They should be planted roots down. Tuberous roots look like fat roots. They should also be planted roots down. Rhizomes look like dried out roots and are usually planted partially submerged in the soil. Iris have rhizomes. Don’t worry if you can’t tell which end is which. Even planted upside down, bulbs will grow in the correct direction.

How to Plant Bulbs in the Fall

Before you begin planting your spring flowering bulbs, think about the “look” you are trying to achieve. Because there is almost nothing else growing in your garden in the spring, tulips, daffodils and other spring flowering bulbs look best in masses or drifts. Planted singly, they look forlorn. You want large groups of plants to make your garden look fuller. This requires large numbers of bulbs. Digging individual holes for each bulb is tedious, not to mention exhausting. Instead, dig large holes for groups of bulbs and trenches for your drifts. Plant groups of bulbs in odd numbers, i.e. 3 or 5 or 7, etc.

How deep should your holes and trenches be? That depends on the size of your bulbs. The general rule of thumb is to plant bulbs 2 ½ times as deep as the size of the bulb. Generally, you should plant large bulbs 6” to 8” deep and 4” to 5” apart. Smaller bulbs such as crocuses and grape hyacinths can be closer together, 2” to 3” deep and apart.

You can save yourself time and effort by planting different types of bulbs in the same holes. Dig your hole (or trench) deep enough to accommodate your large bulbs which will be placed at the bottom of the hole. Cover them with soil until your reach a depth of 2” to 3”, plant your smaller bulbs making sure that you're not planting them directly over the larger bulbs, and then finish filling the hole.

Trees and Bulbs Don’t Mix

It’s not a good idea to plant your bulbs under your trees. They will be competing for the same water and nutrients. With the exception of the very earliest bulbs, the trees will leaf out before the foliage of your bulbs have finished storing food in the bulbs which will send them into decline. The plants and flowers will be smaller the following year. Plant your bulbs in a sunny garden where they will get a minimum of 6 to 8 hours of sun daily.

Can Bulbs be Planted After the Ground Freezes?

What if you forget to plant your bulbs and the ground freezes? Fear not! You can plant your bulbs in containers using the same depth and spacing as you would when planting them directly in your garden. Do not allow the bulbs to touch the sides of the pot. They need the protection of the surrounding soil. Store the container in a window well or your garage during the winter. In the spring, move them outside to your yard and allow them to grow and bloom in the container or plant them in your garden when the ground has thawed.

Mulch Bulbs After Planting

After you have planted your bulbs, cover the soil with mulch. Why mulch when there won’t be any weeds during the winter? Mulch will moderate the temperature of the soil. Without it, the alternate freezing and thawing throughout the winter will cause the soil to heave, sometimes heaving your bulbs right out of the ground. A generous layer of mulch will prevent extreme swings in soil temperature ensuring that your bulbs will stay at the proper depth. Remove the mulch in the spring when all danger of freezing has passed.

How to Plant Bulbs in the Spring

Summer blooming bulbs don’t need to be planted in large groups like spring blooming bulbs. Rather than being the centerpiece, they are components of an overall design. They can blend in or contrast with your other flowers so smaller numbers are required for the desired effect.

Observe the same planting depths and spacing that you used when planting bulbs in the fall. If you live in the North, don’t plant them too close to your perennials so that your valuable plants aren’t disturbed when you dig up your bulbs in the fall. It’s usually a good idea to surround your bulbs with annuals which will be removed at the same time as your bulbs.

How to Plant Iris

Iris can be planted in either the fall or the spring. The advantage to planting them in the fall is that they have an opportunity to develop a root system before winter. The following spring they are ready to grow and bloom. If they are planted in the spring, the flowering will be delayed because they need to develop some roots first.

Iris grow from rhizomes which should be planted only partially submerged in the soil. If you plant them deeper into the soil, the plants will fail to grow and the rhizomes will rot. Unlike other spring planted bulbs, iris are left in the ground over the winter.

No garden is complete without bulbs. Planted properly, they will reward you with years of color.

Questions & Answers

  • I live in Southern California and I just planted tulip bulbs about a week ago. Are they even going to bloom and do they come back do they multiply?

    Tulip bulbs are planted in the fall. They need a period of cold weather to break dormancy. I don't know your specific growing zone so all that I can offer is general advice. Gardeners who live in zone 7 and north, should plant their tulips one month before the ground freezes. In zone 8 and warmer (south), the winters aren't cold enough so gardeners chill their tulip bulbs in their refrigerators for 10 weeks before planting them in their gardens in December or January. I fear that you have planted your tulips much too early. They may germinate, but they may not bloom. I don't know if they will come back. Unlike daffodils which come back year after year and multiply, tulips are more fussy about their growing conditions and usually don't last more that a few years and don't multiply.


    0 of 8192 characters used
    Post Comment
    • OldRoses profile imageAUTHOR

      Caren White 

      13 months ago

      Please don't remove the outer covering of the bulbs. It is there to protect them. I would need to know your growing zone to be able to advise you on when to plant your bulbs. For instance, my NJ garden is zone 6 so I would plant my bulbs later in the spring and the fall than you would in your warmer Southern California garden.

    • profile image

      Brooke Whitehead 

      13 months ago

      Our Southern California weather has been sporadic to say the least. I have no idea when to plant my bulbs are you supposed to take off the outer part of the bulb the brown? It's been fairly cool at night here and only in the 70s during the day last year it was up at 100-110 degrees. I hope I didn't wreck the bulbs. Any advice would be greatly appreciated.

    • Celiegirl profile image


      6 years ago

      Thanks the information was helpful, especially about the soil issues, without mulch.

    • mactavers profile image


      6 years ago

      Good information, thank you. I'll add a tip for those new to the Southern Southwest regions where javalinas are present. Plant your bulbs in walled or other protected areas. Bulbs are javalina "candy" and they will root to find them. They will return to an area again and again where they have found bulbs before.

    • Jackie Lynnley profile image

      Jackie Lynnley 

      6 years ago from the beautiful south

      Great! I will be back to read them!

    • OldRoses profile imageAUTHOR

      Caren White 

      6 years ago

      Hi Jackie! Thanks for reading and the nice compliment. I will be writing hubs on fertilizers with an emphasis on using natural fertilizers in the future.

    • Jackie Lynnley profile image

      Jackie Lynnley 

      6 years ago from the beautiful south

      Great hubs and I will have to come back and catch more. I got 3 chickens so I am trying my hand at making fertilizer and they claim it is wonderful if done right. Hope you have some tips on that! Up and sharing!


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)