The Gardener's Calendar


SPRING

March - May

  • Apply an all-purpose slow-release fertilizer to perennials and shrubs in late March to mid-April

  • Remove any additional leaves that fell through the winter

  • If deer eat your crocuses and other bulbs, start using your deer repellant of choice as flowers emerge. Continue to apply as needed to plants deer love

  • Add a soil acidifier around acid-loving plants such as hollies, azaleas, and rhododendrons in March

  • Cut back any perennials left over from the fall

  • Start irrigation system back up

  • Prune any dead branches out of roses, hydrangeas, and other sensitive shrubs

  • Apply preventative fungicides to any plants that suffer from serious spring fungal infections before rainy weather sets in

  • Begin training climbing vines as the spring growth spurt hits

  • Lawn application Round 1 is applied in March

  • Spring annuals and container arrangements can go in between late March and late April depending on the desired plants

  • Put down pre-emergent herbicide in planting beds in late March to mid-April

  • Put down a fresh layer of mulch – be sure to keep it from touching tree trunks or burying shrubs bases

  • Redefine bed edges

  • If evergreen trees need to be fertilized, early March is a good time

  • Overseed thin lawns and spot-seed bare spots in March

  • Divide perennials as needed when they have emerged enough to find them easily but before the leaves have opened up much – this will be about 3-4” high for most plants

  • Begin pulling or spraying weeds as they emerge (be sure to exercise caution and read all labels when using herbicides)

  • Lawns are ready to be mowed in mid to late April

  • Lawn application Round 2 is applied in late April to early May

  • Put peony supports up while the new growth is still short – as the leaves expand they will hide the hoops

  • Replace plants that didn’t survive the winter

  • Start using slug control around hostas in May

  • Pinch back leggy perennials that bloom in mid-summer by the end of May

  • Deadhead spring-blooming perennials as needed

  • Summer annuals can be planted in mid-May after the last freeze date

  • Prune spring-blooming shrubs such as forsythia and vernal witch hazel as soon as they’re done blooming


SUMMER

June - August

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  • Significant tree pruning can be done in early June after the rainy season and before the weather gets hot

  • Plant summer annuals in the ground and containers in June if you didn’t in May

  • Pull and spray weeds through the summer (be sure to read all labels for herbicides)

  • Deadhead perennials and roses to extend bloom season

  • Stake leaning perennials

  • Cultivate mulch for a fresh look

  • During long dry spells, water drought-sensitive plants

  • Cut back asters and other tall, fall-blooming plants to keep them from getting overgrown in the fall

  • Trim unruly perennials like catmint and Russian sage to keep them from covering paths and other plants

  • Lawn application Round 3 is applied between mid-June and mid-July

  • Keep fountains filled and containers watered in the hot sun

  • Prune shrubs as they get unruly


FALL

September - November

  • Seed new lawns between mid-September and mid-October

  • Pull and spray weeds through the fall (be sure to read all labels for herbicides)

  • Aerate and overseed lawns

  • Lawn application Round 4 is applied in September

  • Starting in mid-September fall annuals are available for containers and in-ground planting

  • Prune shrubs as they get unruly (if you prune spring-blooming shrubs in the fall, you will remove some or all of the next year’s flowers)

  • Cultivate mulch for a fresh look

  • Continue to deadhead perennials, roses, and hydrangeas

  • Cut back many perennials as they drop their leaves and turn brown

  • Leave grasses and other perennials with winter interest – little bluestem and blue false indigo can add a lot to the cold months

  • Do any lawn over-seeding or seed new lawns by the end of September

  • Divide and transplant perennials in mid-September and October

  • Plant bulbs in October and November before the ground freezes

  • Lawn application Round 5 is applied in October

  • Winterize irrigation systems in October and November

  • Sensitive heirloom rose varieties should be tied up with leaves as insulation

  • Disconnect and drain hoses before the first freeze

  • Leaf removals start in October and extend into December

  • Deep root tree fertilization happens in November


WINTER

December - February

  • Put up holiday lights, decorations, and container arrangements

  • Put reflective markers at driveway edges to help snow plows stay on track

  • Watch out for winter damage to trees and shrubs – broken tree branches should be properly pruned before spring

  • Perform any dormant pruning on trees and shrubs

  • Cover or bring in outdoor furniture, cushions, and delicate planters

  • Clean and repair outdoor furniture

  • Review garden plans and dream up ideas for next year